{"abstract":"A channel is isolated after scattered, non-consecutive discrepancies.","category":"Railway interlocking logic","checks":8,"contract":"Three channels report occupancy (True/False) or None when failed. A channel isolated earlier counts as None. With fewer than two healthy channels the vote is occupied. Otherwise the vote is occupied when occupied reports are at least as many as clear ones (ties are occupied). A healthy channel that disagrees with the vote increments its discrepancy count, otherwise (agreeing or None) the count resets; a channel is isolated for good when its count reaches isolate_after. Return all votes and isolated channel indices.","evaluation_group":"w2-railway_interlocking_logic-two-out-of-three-voting","failed_approach":"Not resetting on a failed report lets discrepancies straddle a failure.","family":"w2-railway_interlocking_logic-two-out-of-three-voting-discrepancy-reset","id":"FA-67116","implementations":{"attempt":{"sha256":"00c762741e45943c29acdf362a1c9758edb66609f3ece05a0766ce585bc9e8ba","source":"\"\"\"Failure Map reference implementation. Python standard library only.\"\"\"\nimport json\n\nN = 1\nobservations = []\ndef solve(x):\n    k = x['isolate_after']\n    bad = [0, 0, 0]\n    iso = [False, False, False]\n    votes = []\n    for cyc in x['cycles']:\n        vals = [None if iso[i] else cyc[i] for i in range(3)]\n        healthy = [v for v in vals if v is not None]\n        if len(healthy) < 2:\n            vote = True\n        else:\n            t = sum(1 for v in healthy if v)\n            f = len(healthy) - t\n            vote = t >= f\n        votes.append(vote)\n        for i in range(3):\n            if vals[i] is not None and vals[i] != vote:\n                bad[i] += 1\n                if bad[i] >= k:\n                    iso[i] = True\n            elif vals[i] is not None:\n                bad[i] = 0\n    return {'votes': votes, 'isolated': [i for i in range(3) if iso[i]]}\ndef check(label, actual, expected):\n    observations.append({\"check\": label, \"actual\": actual, \"expected\": expected, \"passed\": actual == expected})\nfixtures = [[('regression: dissent interrupted by failure', {'isolate_after': 2, 'cycles': [[True, False, False], [None, False, False], [True, False, False]]}, {'votes': [False, False, False], 'isolated': []}), ('sampled regression 10', {'isolate_after': 2, 'cycles': [[None, True, False], [False, None, True], [False, False, False], [False, True, False], [False, True, False], [True, True, False], [False, None, False], [True, True, True]]}, {'votes': [True, True, False, False, False, True, False, True], 'isolated': [1]}), ('sampled regression 9', {'isolate_after': 3, 'cycles': [[None, False, False], [None, True, False], [False, None, None], [False, False, True], [True, None, False], [True, True, True], [None, False, None], [False, False, False], [True, None, False]]}, {'votes': [False, True, True, False, True, True, True, False, True], 'isolated': []}), ('boundary: two healthy channels disagree', {'isolate_after': 3, 'cycles': [[True, False, None]]}, {'votes': [True], 'isolated': []}), ('boundary: two healthy channels agree clear', {'isolate_after': 3, 'cycles': [[False, False, None]]}, {'votes': [False], 'isolated': []}), ('control 1', {'isolate_after': 2, 'cycles': [[False, False, False], [True, None, True], [True, True, True], [None, False, False]]}, {'votes': [False, True, True, False], 'isolated': []}), ('control 4', {'isolate_after': 2, 'cycles': [[False, True, True], [False, False, False], [False, False, False], [True, True, False], [True, True, True], [True, False, True], [False, False, False], [False, False, None], [True, True, True]]}, {'votes': [True, False, False, True, True, True, False, False, True], 'isolated': []}), ('control 7', {'isolate_after': 3, 'cycles': [[False, False, True], [False, False, False], [True, True, True], [False, True, True], [True, True, None], [False, False, False], [True, True, True], [False, False, False]]}, {'votes': [False, False, True, True, True, False, True, False], 'isolated': []})], [('regression: dissent interrupted by failure', {'isolate_after': 2, 'cycles': [[True, False, False], [None, False, False], [True, False, False]]}, {'votes': [False, False, False], 'isolated': []}), ('sampled regression 36', {'isolate_after': 3, 'cycles': [[None, True, False], [None, False, False], [False, False, True], [False, False, False], [True, True, False], [True, True, True], [True, True, None], [True, True, True]]}, {'votes': [True, False, False, False, True, True, True, True], 'isolated': []}), ('sampled regression 19', {'isolate_after': 2, 'cycles': [[True, True, True], [True, False, None], [True, False, True], [None, False, False], [True, True, None], [True, False, False], [False, False, True], [True, True, True]]}, {'votes': [True, True, True, True, True, True, True, True], 'isolated': [1]}), ('boundary: single healthy channel says clear', {'isolate_after': 3, 'cycles': [[False, None, None]]}, {'votes': [True], 'isolated': []}), ('boundary: persistent dissenter', {'isolate_after': 2, 'cycles': [[True, False, False], [True, False, False], [False, False, False]]}, {'votes': [False, False, False], 'isolated': [0]}), ('control 12', {'isolate_after': 3, 'cycles': [[False, False, False], [False, True, False], [True, False, True], [True, False, True], [False, False, True], [False, False, False], [True, False, True], [True, True, True]]}, {'votes': [False, False, True, True, True, False, True, True], 'isolated': [1]}), ('control 15', {'isolate_after': 3, 'cycles': [[False, False, False], [False, None, False], [True, False, False], [True, None, False]]}, {'votes': [False, False, False, True], 'isolated': []}), ('sampled regression 18', {'isolate_after': 2, 'cycles': [[False, False, False], [None, False, True], [False, False, True], [True, False, False], [True, False, True], [False, False, False], [False, True, None], [False, False, False], [False, False, False]]}, {'votes': [False, True, False, False, True, False, True, False, False], 'isolated': []})], [('regression: dissent interrupted by failure', {'isolate_after': 2, 'cycles': [[True, False, False], [None, False, False], [True, False, False]]}, {'votes': [False, False, False], 'isolated': []}), ('sampled regression 71', {'isolate_after': 2, 'cycles': [[False, False, None], [True, False, True], [False, False, False], [False, True, False]]}, {'votes': [False, True, False, False], 'isolated': []}), ('sampled regression 20', {'isolate_after': 2, 'cycles': [[False, True, False], [True, False, False], [True, False, None], [False, None, False], [False, True, False], [False, None, None]]}, {'votes': [False, False, True, False, False, True], 'isolated': []}), ('boundary: two dissenters in turn', {'isolate_after': 2, 'cycles': [[True, False, False], [True, False, False], [False, True, False], [False, True, False], [False, False, False]]}, {'votes': [False, False, True, True, True], 'isolated': [0, 2]}), ('boundary: isolated channel keeps reporting', {'isolate_after': 1, 'cycles': [[True, False, False], [True, True, False]]}, {'votes': [False, True], 'isolated': [0, 2]}), ('control 23', {'isolate_after': 2, 'cycles': [[True, False, True], [None, False, False], [False, False, False], [False, False, False], [False, False, None], [False, False, False], [True, None, True]]}, {'votes': [True, False, False, False, False, False, True], 'isolated': []}), ('control 26', {'isolate_after': 2, 'cycles': [[True, True, True], [False, False, False], [False, False, True], [False, False, None]]}, {'votes': [True, False, False, False], 'isolated': []}), ('sampled regression 29', {'isolate_after': 2, 'cycles': [[False, False, True], [False, False, False], [False, False, True], [False, True, False], [False, True, True]]}, {'votes': [False, False, False, False, True], 'isolated': []})], [('regression: dissent interrupted by failure', {'isolate_after': 2, 'cycles': [[True, False, False], [None, False, False], [True, False, False]]}, {'votes': [False, False, False], 'isolated': []}), ('sampled regression 9', {'isolate_after': 3, 'cycles': [[None, False, False], [None, True, False], [False, None, None], [False, False, True], [True, None, False], [True, True, True], [None, False, None], [False, False, False], [True, None, False]]}, {'votes': [False, True, True, False, True, True, True, False, True], 'isolated': []}), ('boundary: isolated channel keeps reporting', {'isolate_after': 1, 'cycles': [[True, False, False], [True, True, False]]}, {'votes': [False, True], 'isolated': [0, 2]}), ('boundary: two healthy channels disagree', {'isolate_after': 3, 'cycles': [[True, False, None]]}, {'votes': [True], 'isolated': []}), ('boundary: two healthy channels agree clear', {'isolate_after': 3, 'cycles': [[False, False, None]]}, {'votes': [False], 'isolated': []}), ('sampled regression 34', {'isolate_after': 2, 'cycles': [[True, True, False], [False, True, False], [True, True, True], [True, True, True], [True, False, True], [False, False, False], [True, False, True]]}, {'votes': [True, False, True, True, True, False, True], 'isolated': []}), ('control 37', {'isolate_after': 3, 'cycles': [[True, True, True], [False, False, False], [False, False, False], [False, True, False], [True, False, False], [False, False, False]]}, {'votes': [True, False, False, False, False, False], 'isolated': []}), ('control 40', {'isolate_after': 2, 'cycles': [[True, None, True], [False, False, None], [False, True, False], [False, True, False], [True, True, True], [True, None, False], [None, False, False], [True, True, True]]}, {'votes': [True, False, False, False, True, True, True, True], 'isolated': [1, 2]})], [('regression: dissent interrupted by failure', {'isolate_after': 2, 'cycles': [[True, False, False], [None, False, False], [True, False, False]]}, {'votes': [False, False, False], 'isolated': []}), ('sampled regression 34', {'isolate_after': 2, 'cycles': [[True, True, False], [False, True, False], [True, True, True], [True, True, True], [True, False, True], [False, False, False], [True, False, True]]}, {'votes': [True, False, True, True, True, False, True], 'isolated': []}), ('sampled regression 9', {'isolate_after': 3, 'cycles': [[None, False, False], [None, True, False], [False, None, None], [False, False, True], [True, None, False], [True, True, True], [None, False, None], [False, False, False], [True, None, False]]}, {'votes': [False, True, True, False, True, True, True, False, True], 'isolated': []}), ('boundary: two healthy channels agree clear', {'isolate_after': 3, 'cycles': [[False, False, None]]}, {'votes': [False], 'isolated': []}), ('boundary: single healthy channel says clear', {'isolate_after': 3, 'cycles': [[False, None, None]]}, {'votes': [True], 'isolated': []}), ('sampled regression 45', {'isolate_after': 2, 'cycles': [[True, True, True], [False, False, False], [False, False, False], [False, True, False], [None, True, False], [None, True, False], [True, False, False]]}, {'votes': [True, False, False, False, True, True, True], 'isolated': [2]}), ('sampled regression 48', {'isolate_after': 2, 'cycles': [[False, False, False], [False, False, False], [False, True, True], [True, True, None], [False, True, False], [True, True, True], [False, False, False], [False, False, False], [False, True, False]]}, {'votes': [False, False, True, True, False, True, False, False, False], 'isolated': []}), ('control 51', {'isolate_after': 3, 'cycles': [[False, False, False], [True, False, False], [True, True, True], [True, True, True], [True, True, True], [True, True, True], [True, False, True], [True, False, False], [True, True, True]]}, {'votes': [False, False, True, True, True, True, True, False, True], 'isolated': []})]]\nfor label, args, expected in fixtures[N-1]:\n    check(label, solve(args), expected)\nprint(json.dumps({\"observations\": observations, \"passed\": all(x[\"passed\"] for x in observations)}, ensure_ascii=False))\nraise SystemExit(0 if all(x[\"passed\"] for x in observations) else 1)\n"},"broken":{"sha256":"cb451719b48c35c6b3cc2718330fa38daf5698fad896cdcced1b9727aa4210c8","source":"\"\"\"Failure Map reference implementation. Python standard library only.\"\"\"\nimport json\n\nN = 1\nobservations = []\ndef solve(x):\n    k = x['isolate_after']\n    bad = [0, 0, 0]\n    iso = [False, False, False]\n    votes = []\n    for cyc in x['cycles']:\n        vals = [None if iso[i] else cyc[i] for i in range(3)]\n        healthy = [v for v in vals if v is not None]\n        if len(healthy) < 2:\n            vote = True\n        else:\n            t = sum(1 for v in healthy if v)\n            f = len(healthy) - t\n            vote = t >= f\n        votes.append(vote)\n        for i in range(3):\n            if vals[i] is not None and vals[i] != vote:\n                bad[i] += 1\n                if bad[i] >= k:\n                    iso[i] = True\n            else:\n                pass\n    return {'votes': votes, 'isolated': [i for i in range(3) if iso[i]]}\ndef check(label, actual, expected):\n    observations.append({\"check\": label, \"actual\": actual, \"expected\": expected, \"passed\": actual == expected})\nfixtures = [[('regression: dissent interrupted by failure', {'isolate_after': 2, 'cycles': [[True, False, False], [None, False, False], [True, False, False]]}, {'votes': [False, False, False], 'isolated': []}), ('sampled regression 10', {'isolate_after': 2, 'cycles': [[None, True, False], [False, None, True], [False, False, False], [False, True, False], [False, True, False], [True, True, False], [False, None, False], [True, True, True]]}, {'votes': [True, True, False, False, False, True, False, True], 'isolated': [1]}), ('sampled regression 9', {'isolate_after': 3, 'cycles': [[None, False, False], [None, True, False], [False, None, None], [False, False, True], [True, None, False], [True, True, True], [None, False, None], [False, False, False], [True, None, False]]}, {'votes': [False, True, True, False, True, True, True, False, True], 'isolated': []}), ('boundary: two healthy channels disagree', {'isolate_after': 3, 'cycles': [[True, False, None]]}, {'votes': [True], 'isolated': []}), ('boundary: two healthy channels agree clear', {'isolate_after': 3, 'cycles': [[False, False, None]]}, {'votes': [False], 'isolated': []}), ('control 1', {'isolate_after': 2, 'cycles': [[False, False, False], [True, None, True], [True, True, True], [None, False, False]]}, {'votes': [False, True, True, False], 'isolated': []}), ('control 4', {'isolate_after': 2, 'cycles': [[False, True, True], [False, False, False], [False, False, False], [True, True, False], [True, True, True], [True, False, True], [False, False, False], [False, False, None], [True, True, True]]}, {'votes': [True, False, False, True, True, True, False, False, True], 'isolated': []}), ('control 7', {'isolate_after': 3, 'cycles': [[False, False, True], [False, False, False], [True, True, True], [False, True, True], [True, True, None], [False, False, False], [True, True, True], [False, False, False]]}, {'votes': [False, False, True, True, True, False, True, False], 'isolated': []})], [('regression: dissent interrupted by failure', {'isolate_after': 2, 'cycles': [[True, False, False], [None, False, False], [True, False, False]]}, {'votes': [False, False, False], 'isolated': []}), ('sampled regression 36', {'isolate_after': 3, 'cycles': [[None, True, False], [None, False, False], [False, False, True], [False, False, False], [True, True, False], [True, True, True], [True, True, None], [True, True, True]]}, {'votes': [True, False, False, False, True, True, True, True], 'isolated': []}), ('sampled regression 19', {'isolate_after': 2, 'cycles': [[True, True, True], [True, False, None], [True, False, True], [None, False, False], [True, True, None], [True, False, False], [False, False, True], [True, True, True]]}, {'votes': [True, True, True, True, True, True, True, True], 'isolated': [1]}), ('boundary: single healthy channel says clear', {'isolate_after': 3, 'cycles': [[False, None, None]]}, {'votes': [True], 'isolated': []}), ('boundary: persistent dissenter', {'isolate_after': 2, 'cycles': [[True, False, False], [True, False, False], [False, False, False]]}, {'votes': [False, False, False], 'isolated': [0]}), ('control 12', {'isolate_after': 3, 'cycles': [[False, False, False], [False, True, False], [True, False, True], [True, False, True], [False, False, True], [False, False, False], [True, False, True], [True, True, True]]}, {'votes': [False, False, True, True, True, False, True, True], 'isolated': [1]}), ('control 15', {'isolate_after': 3, 'cycles': [[False, False, False], [False, None, False], [True, False, False], [True, None, False]]}, {'votes': [False, False, False, True], 'isolated': []}), ('sampled regression 18', {'isolate_after': 2, 'cycles': [[False, False, False], [None, False, True], [False, False, True], [True, False, False], [True, False, True], [False, False, False], [False, True, None], [False, False, False], [False, False, False]]}, {'votes': [False, True, False, False, True, False, True, False, False], 'isolated': []})], [('regression: dissent interrupted by failure', {'isolate_after': 2, 'cycles': [[True, False, False], [None, False, False], [True, False, False]]}, {'votes': [False, False, False], 'isolated': []}), ('sampled regression 71', {'isolate_after': 2, 'cycles': [[False, False, None], [True, False, True], [False, False, False], [False, True, False]]}, {'votes': [False, True, False, False], 'isolated': []}), ('sampled regression 20', {'isolate_after': 2, 'cycles': [[False, True, False], [True, False, False], [True, False, None], [False, None, False], [False, True, False], [False, None, None]]}, {'votes': [False, False, True, False, False, True], 'isolated': []}), ('boundary: two dissenters in turn', {'isolate_after': 2, 'cycles': [[True, False, False], [True, False, False], [False, True, False], [False, True, False], [False, False, False]]}, {'votes': [False, False, True, True, True], 'isolated': [0, 2]}), ('boundary: isolated channel keeps reporting', {'isolate_after': 1, 'cycles': [[True, False, False], [True, True, False]]}, {'votes': [False, True], 'isolated': [0, 2]}), ('control 23', {'isolate_after': 2, 'cycles': [[True, False, True], [None, False, False], [False, False, False], [False, False, False], [False, False, None], [False, False, False], [True, None, True]]}, {'votes': [True, False, False, False, False, False, True], 'isolated': []}), ('control 26', {'isolate_after': 2, 'cycles': [[True, True, True], [False, False, False], [False, False, True], [False, False, None]]}, {'votes': [True, False, False, False], 'isolated': []}), ('sampled regression 29', {'isolate_after': 2, 'cycles': [[False, False, True], [False, False, False], [False, False, True], [False, True, False], [False, True, True]]}, {'votes': [False, False, False, False, True], 'isolated': []})], [('regression: dissent interrupted by failure', {'isolate_after': 2, 'cycles': [[True, False, False], [None, False, False], [True, False, False]]}, {'votes': [False, False, False], 'isolated': []}), ('sampled regression 9', {'isolate_after': 3, 'cycles': [[None, False, False], [None, True, False], [False, None, None], [False, False, True], [True, None, False], [True, True, True], [None, False, None], [False, False, False], [True, None, False]]}, {'votes': [False, True, True, False, True, True, True, False, True], 'isolated': []}), ('boundary: isolated channel keeps reporting', {'isolate_after': 1, 'cycles': [[True, False, False], [True, True, False]]}, {'votes': [False, True], 'isolated': [0, 2]}), ('boundary: two healthy channels disagree', {'isolate_after': 3, 'cycles': [[True, False, None]]}, {'votes': [True], 'isolated': []}), ('boundary: two healthy channels agree clear', {'isolate_after': 3, 'cycles': [[False, False, None]]}, {'votes': [False], 'isolated': []}), ('sampled regression 34', {'isolate_after': 2, 'cycles': [[True, True, False], [False, True, False], [True, True, True], [True, True, True], [True, False, True], [False, False, False], [True, False, True]]}, {'votes': [True, False, True, True, True, False, True], 'isolated': []}), ('control 37', {'isolate_after': 3, 'cycles': [[True, True, True], [False, False, False], [False, False, False], [False, True, False], [True, False, False], [False, False, False]]}, {'votes': [True, False, False, False, False, False], 'isolated': []}), ('control 40', {'isolate_after': 2, 'cycles': [[True, None, True], [False, False, None], [False, True, False], [False, True, False], [True, True, True], [True, None, False], [None, False, False], [True, True, True]]}, {'votes': [True, False, False, False, True, True, True, True], 'isolated': [1, 2]})], [('regression: dissent interrupted by failure', {'isolate_after': 2, 'cycles': [[True, False, False], [None, False, False], [True, False, False]]}, {'votes': [False, False, False], 'isolated': []}), ('sampled regression 34', {'isolate_after': 2, 'cycles': [[True, True, False], [False, True, False], [True, True, True], [True, True, True], [True, False, True], [False, False, False], [True, False, True]]}, {'votes': [True, False, True, True, True, False, True], 'isolated': []}), ('sampled regression 9', {'isolate_after': 3, 'cycles': [[None, False, False], [None, True, False], [False, None, None], [False, False, True], [True, None, False], [True, True, True], [None, False, None], [False, False, False], [True, None, False]]}, {'votes': [False, True, True, False, True, True, True, False, True], 'isolated': []}), ('boundary: two healthy channels agree clear', {'isolate_after': 3, 'cycles': [[False, False, None]]}, {'votes': [False], 'isolated': []}), ('boundary: single healthy channel says clear', {'isolate_after': 3, 'cycles': [[False, None, None]]}, {'votes': [True], 'isolated': []}), ('sampled regression 45', {'isolate_after': 2, 'cycles': [[True, True, True], [False, False, False], [False, False, False], [False, True, False], [None, True, False], [None, True, False], [True, False, False]]}, {'votes': [True, False, False, False, True, True, True], 'isolated': [2]}), ('sampled regression 48', {'isolate_after': 2, 'cycles': [[False, False, False], [False, False, False], [False, True, True], [True, True, None], [False, True, False], [True, True, True], [False, False, False], [False, False, False], [False, True, False]]}, {'votes': [False, False, True, True, False, True, False, False, False], 'isolated': []}), ('control 51', {'isolate_after': 3, 'cycles': [[False, False, False], [True, False, False], [True, True, True], [True, True, True], [True, True, True], [True, True, True], [True, False, True], [True, False, False], [True, True, True]]}, {'votes': [False, False, True, True, True, True, True, False, True], 'isolated': []})]]\nfor label, args, expected in fixtures[N-1]:\n    check(label, solve(args), expected)\nprint(json.dumps({\"observations\": observations, \"passed\": all(x[\"passed\"] for x in observations)}, ensure_ascii=False))\nraise SystemExit(0 if all(x[\"passed\"] for x in observations) else 1)\n"},"fixed":{"sha256":"b5774886046f5af10dcd977d59836b0027809f5a10f61310bcdd218a73785003","source":"\"\"\"Failure Map reference implementation. Python standard library only.\"\"\"\nimport json\n\nN = 1\nobservations = []\ndef solve(x):\n    k = x['isolate_after']\n    bad = [0, 0, 0]\n    iso = [False, False, False]\n    votes = []\n    for cyc in x['cycles']:\n        vals = [None if iso[i] else cyc[i] for i in range(3)]\n        healthy = [v for v in vals if v is not None]\n        if len(healthy) < 2:\n            vote = True\n        else:\n            t = sum(1 for v in healthy if v)\n            f = len(healthy) - t\n            vote = t >= f\n        votes.append(vote)\n        for i in range(3):\n            if vals[i] is not None and vals[i] != vote:\n                bad[i] += 1\n                if bad[i] >= k:\n                    iso[i] = True\n            else:\n                bad[i] = 0\n    return {'votes': votes, 'isolated': [i for i in range(3) if iso[i]]}\ndef check(label, actual, expected):\n    observations.append({\"check\": label, \"actual\": actual, \"expected\": expected, \"passed\": actual == expected})\nfixtures = [[('regression: dissent interrupted by failure', {'isolate_after': 2, 'cycles': [[True, False, False], [None, False, False], [True, False, False]]}, {'votes': [False, False, False], 'isolated': []}), ('sampled regression 10', {'isolate_after': 2, 'cycles': [[None, True, False], [False, None, True], [False, False, False], [False, True, False], [False, True, False], [True, True, False], [False, None, False], [True, True, True]]}, {'votes': [True, True, False, False, False, True, False, True], 'isolated': [1]}), ('sampled regression 9', {'isolate_after': 3, 'cycles': [[None, False, False], [None, True, False], [False, None, None], [False, False, True], [True, None, False], [True, True, True], [None, False, None], [False, False, False], [True, None, False]]}, {'votes': [False, True, True, False, True, True, True, False, True], 'isolated': []}), ('boundary: two healthy channels disagree', {'isolate_after': 3, 'cycles': [[True, False, None]]}, {'votes': [True], 'isolated': []}), ('boundary: two healthy channels agree clear', {'isolate_after': 3, 'cycles': [[False, False, None]]}, {'votes': [False], 'isolated': []}), ('control 1', {'isolate_after': 2, 'cycles': [[False, False, False], [True, None, True], [True, True, True], [None, False, False]]}, {'votes': [False, True, True, False], 'isolated': []}), ('control 4', {'isolate_after': 2, 'cycles': [[False, True, True], [False, False, False], [False, False, False], [True, True, False], [True, True, True], [True, False, True], [False, False, False], [False, False, None], [True, True, True]]}, {'votes': [True, False, False, True, True, True, False, False, True], 'isolated': []}), ('control 7', {'isolate_after': 3, 'cycles': [[False, False, True], [False, False, False], [True, True, True], [False, True, True], [True, True, None], [False, False, False], [True, True, True], [False, False, False]]}, {'votes': [False, False, True, True, True, False, True, False], 'isolated': []})], [('regression: dissent interrupted by failure', {'isolate_after': 2, 'cycles': [[True, False, False], [None, False, False], [True, False, False]]}, {'votes': [False, False, False], 'isolated': []}), ('sampled regression 36', {'isolate_after': 3, 'cycles': [[None, True, False], [None, False, False], [False, False, True], [False, False, False], [True, True, False], [True, True, True], [True, True, None], [True, True, True]]}, {'votes': [True, False, False, False, True, True, True, True], 'isolated': []}), ('sampled regression 19', {'isolate_after': 2, 'cycles': [[True, True, True], [True, False, None], [True, False, True], [None, False, False], [True, True, None], [True, False, False], [False, False, True], [True, True, True]]}, {'votes': [True, True, True, True, True, True, True, True], 'isolated': [1]}), ('boundary: single healthy channel says clear', {'isolate_after': 3, 'cycles': [[False, None, None]]}, {'votes': [True], 'isolated': []}), ('boundary: persistent dissenter', {'isolate_after': 2, 'cycles': [[True, False, False], [True, False, False], [False, False, False]]}, {'votes': [False, False, False], 'isolated': [0]}), ('control 12', {'isolate_after': 3, 'cycles': [[False, False, False], [False, True, False], [True, False, True], [True, False, True], [False, False, True], [False, False, False], [True, False, True], [True, True, True]]}, {'votes': [False, False, True, True, True, False, True, True], 'isolated': [1]}), ('control 15', {'isolate_after': 3, 'cycles': [[False, False, False], [False, None, False], [True, False, False], [True, None, False]]}, {'votes': [False, False, False, True], 'isolated': []}), ('sampled regression 18', {'isolate_after': 2, 'cycles': [[False, False, False], [None, False, True], [False, False, True], [True, False, False], [True, False, True], [False, False, False], [False, True, None], [False, False, False], [False, False, False]]}, {'votes': [False, True, False, False, True, False, True, False, False], 'isolated': []})], [('regression: dissent interrupted by failure', {'isolate_after': 2, 'cycles': [[True, False, False], [None, False, False], [True, False, False]]}, {'votes': [False, False, False], 'isolated': []}), ('sampled regression 71', {'isolate_after': 2, 'cycles': [[False, False, None], [True, False, True], [False, False, False], [False, True, False]]}, {'votes': [False, True, False, False], 'isolated': []}), ('sampled regression 20', {'isolate_after': 2, 'cycles': [[False, True, False], [True, False, False], [True, False, None], [False, None, False], [False, True, False], [False, None, None]]}, {'votes': [False, False, True, False, False, True], 'isolated': []}), ('boundary: two dissenters in turn', {'isolate_after': 2, 'cycles': [[True, False, False], [True, False, False], [False, True, False], [False, True, False], [False, False, False]]}, {'votes': [False, False, True, True, True], 'isolated': [0, 2]}), ('boundary: isolated channel keeps reporting', {'isolate_after': 1, 'cycles': [[True, False, False], [True, True, False]]}, {'votes': [False, True], 'isolated': [0, 2]}), ('control 23', {'isolate_after': 2, 'cycles': [[True, False, True], [None, False, False], [False, False, False], [False, False, False], [False, False, None], [False, False, False], [True, None, True]]}, {'votes': [True, False, False, False, False, False, True], 'isolated': []}), ('control 26', {'isolate_after': 2, 'cycles': [[True, True, True], [False, False, False], [False, False, True], [False, False, None]]}, {'votes': [True, False, False, False], 'isolated': []}), ('sampled regression 29', {'isolate_after': 2, 'cycles': [[False, False, True], [False, False, False], [False, False, True], [False, True, False], [False, True, True]]}, {'votes': [False, False, False, False, True], 'isolated': []})], [('regression: dissent interrupted by failure', {'isolate_after': 2, 'cycles': [[True, False, False], [None, False, False], [True, False, False]]}, {'votes': [False, False, False], 'isolated': []}), ('sampled regression 9', {'isolate_after': 3, 'cycles': [[None, False, False], [None, True, False], [False, None, None], [False, False, True], [True, None, False], [True, True, True], [None, False, None], [False, False, False], [True, None, False]]}, {'votes': [False, True, True, False, True, True, True, False, True], 'isolated': []}), ('boundary: isolated channel keeps reporting', {'isolate_after': 1, 'cycles': [[True, False, False], [True, True, False]]}, {'votes': [False, True], 'isolated': [0, 2]}), ('boundary: two healthy channels disagree', {'isolate_after': 3, 'cycles': [[True, False, None]]}, {'votes': [True], 'isolated': []}), ('boundary: two healthy channels agree clear', {'isolate_after': 3, 'cycles': [[False, False, None]]}, {'votes': [False], 'isolated': []}), ('sampled regression 34', {'isolate_after': 2, 'cycles': [[True, True, False], [False, True, False], [True, True, True], [True, True, True], [True, False, True], [False, False, False], [True, False, True]]}, {'votes': [True, False, True, True, True, False, True], 'isolated': []}), ('control 37', {'isolate_after': 3, 'cycles': [[True, True, True], [False, False, False], [False, False, False], [False, True, False], [True, False, False], [False, False, False]]}, {'votes': [True, False, False, False, False, False], 'isolated': []}), ('control 40', {'isolate_after': 2, 'cycles': [[True, None, True], [False, False, None], [False, True, False], [False, True, False], [True, True, True], [True, None, False], [None, False, False], [True, True, True]]}, {'votes': [True, False, False, False, True, True, True, True], 'isolated': [1, 2]})], [('regression: dissent interrupted by failure', {'isolate_after': 2, 'cycles': [[True, False, False], [None, False, False], [True, False, False]]}, {'votes': [False, False, False], 'isolated': []}), ('sampled regression 34', {'isolate_after': 2, 'cycles': [[True, True, False], [False, True, False], [True, True, True], [True, True, True], [True, False, True], [False, False, False], [True, False, True]]}, {'votes': [True, False, True, True, True, False, True], 'isolated': []}), ('sampled regression 9', {'isolate_after': 3, 'cycles': [[None, False, False], [None, True, False], [False, None, None], [False, False, True], [True, None, False], [True, True, True], [None, False, None], [False, False, False], [True, None, False]]}, {'votes': [False, True, True, False, True, True, True, False, True], 'isolated': []}), ('boundary: two healthy channels agree clear', {'isolate_after': 3, 'cycles': [[False, False, None]]}, {'votes': [False], 'isolated': []}), ('boundary: single healthy channel says clear', {'isolate_after': 3, 'cycles': [[False, None, None]]}, {'votes': [True], 'isolated': []}), ('sampled regression 45', {'isolate_after': 2, 'cycles': [[True, True, True], [False, False, False], [False, False, False], [False, True, False], [None, True, False], [None, True, False], [True, False, False]]}, {'votes': [True, False, False, False, True, True, True], 'isolated': [2]}), ('sampled regression 48', {'isolate_after': 2, 'cycles': [[False, False, False], [False, False, False], [False, True, True], [True, True, None], [False, True, False], [True, True, True], [False, False, False], [False, False, False], [False, True, False]]}, {'votes': [False, False, True, True, False, True, False, False, False], 'isolated': []}), ('control 51', {'isolate_after': 3, 'cycles': [[False, False, False], [True, False, False], [True, True, True], [True, True, True], [True, True, True], [True, True, True], [True, False, True], [True, False, False], [True, True, True]]}, {'votes': [False, False, True, True, True, True, True, False, True], 'isolated': []})]]\nfor label, args, expected in fixtures[N-1]:\n    check(label, solve(args), expected)\nprint(json.dumps({\"observations\": observations, \"passed\": all(x[\"passed\"] for x in observations)}, ensure_ascii=False))\nraise SystemExit(0 if all(x[\"passed\"] for x in observations) else 1)\n"}},"limitations":"Stipulated toy interlocking contract for a bounded teaching model; it makes no claim of conformance to any railway signalling standard and omits real safety cases. This reproducer isolates one failure mechanism. Results cover the supplied fixtures. Variants within a family share a test contract and should remain grouped when constructing evaluation splits. Related mechanisms with a shared evaluation_group must also remain together; these controlled models are not independent production incidents.","method":"Deterministic executable model with adversarial boundary fixtures.","provenance":{"created_by":"Failure Map","dependencies":"Python standard library","family":"w2-railway_interlocking_logic-two-out-of-three-voting-discrepancy-reset","generated_at":"2026-09-29T14:47:49.915001+00:00","license":"CC0-1.0","python":"3.12.14","seed":1,"split":"open-access"},"relevance":"Interlocking logic decides whether trains may be given authority; a wrong decision at this point either grants unsafe movements or strands traffic.","repair":"Reset the count whenever the channel agrees or reports failure.","root_cause":"The discrepancy count is never reset when the channel agrees.","sha256":"3e0fa4198817bd99ce68b72a2bed90fa20c2b928e12475b2d77afa67c77096ec","title":"Two-out-of-three occupancy voting: discrepancy reset · case 01","variant":1,"variant_policy":"Five numbered records share a model and may reuse boundary fixtures.","verification":{"attempt":{"elapsed_ms":37.974,"exit_code":1,"observations":[{"actual":{"isolated":[0],"votes":[false,false,false]},"check":"regression: dissent interrupted by failure","expected":{"isolated":[],"votes":[false,false,false]},"passed":false},{"actual":{"isolated":[1],"votes":[true,true,false,false,false,true,false,true]},"check":"sampled regression 10","expected":{"isolated":[1],"votes":[true,true,false,false,false,true,false,true]},"passed":true},{"actual":{"isolated":[2],"votes":[false,true,true,false,true,true,true,false,true]},"check":"sampled regression 9","expected":{"isolated":[],"votes":[false,true,true,false,true,true,true,false,true]},"passed":false},{"actual":{"isolated":[],"votes":[true]},"check":"boundary: two healthy channels disagree","expected":{"isolated":[],"votes":[true]},"passed":true},{"actual":{"isolated":[],"votes":[false]},"check":"boundary: two healthy channels agree clear","expected":{"isolated":[],"votes":[false]},"passed":true},{"actual":{"isolated":[],"votes":[false,true,true,false]},"check":"control 1","expected":{"isolated":[],"votes":[false,true,true,false]},"passed":true},{"actual":{"isolated":[],"votes":[true,false,false,true,true,true,false,false,true]},"check":"control 4","expected":{"isolated":[],"votes":[true,false,false,true,true,true,false,false,true]},"passed":true},{"actual":{"isolated":[],"votes":[false,false,true,true,true,false,true,false]},"check":"control 7","expected":{"isolated":[],"votes":[false,false,true,true,true,false,true,false]},"passed":true}],"passed":false,"stderr":"","stdout":"{\"observations\": [{\"check\": \"regression: dissent interrupted by failure\", \"actual\": {\"votes\": [false, false, false], \"isolated\": [0]}, \"expected\": {\"votes\": [false, false, false], \"isolated\": []}, \"passed\": false}, {\"check\": \"sampled regression 10\", \"actual\": {\"votes\": [true, true, false, false, false, true, false, true], \"isolated\": [1]}, \"expected\": {\"votes\": [true, true, false, false, false, true, false, true], \"isolated\": [1]}, \"passed\": true}, {\"check\": \"sampled regression 9\", \"actual\": {\"votes\": [false, true, true, false, true, true, true, false, true], \"isolated\": [2]}, \"expected\": {\"votes\": [false, true, true, false, true, true, true, false, true], \"isolated\": []}, \"passed\": false}, {\"check\": \"boundary: two healthy channels disagree\", \"actual\": {\"votes\": [true], \"isolated\": []}, \"expected\": {\"votes\": [true], \"isolated\": []}, \"passed\": true}, {\"check\": \"boundary: two healthy channels agree clear\", \"actual\": {\"votes\": [false], \"isolated\": []}, \"expected\": {\"votes\": [false], \"isolated\": []}, \"passed\": true}, {\"check\": \"control 1\", \"actual\": {\"votes\": [false, true, true, false], \"isolated\": []}, \"expected\": {\"votes\": [false, true, true, false], \"isolated\": []}, \"passed\": true}, {\"check\": \"control 4\", \"actual\": {\"votes\": [true, false, false, true, true, true, false, false, true], \"isolated\": []}, \"expected\": {\"votes\": [true, false, false, true, true, true, false, false, true], \"isolated\": []}, \"passed\": true}, {\"check\": \"control 7\", \"actual\": {\"votes\": [false, false, true, true, true, false, true, false], \"isolated\": []}, \"expected\": {\"votes\": [false, false, true, true, true, false, true, false], \"isolated\": []}, \"passed\": true}], \"passed\": false}\n"},"broken":{"elapsed_ms":39.383,"exit_code":1,"observations":[{"actual":{"isolated":[0],"votes":[false,false,false]},"check":"regression: dissent interrupted by failure","expected":{"isolated":[],"votes":[false,false,false]},"passed":false},{"actual":{"isolated":[0,1,2],"votes":[true,true,false,false,false,true,true,true]},"check":"sampled regression 10","expected":{"isolated":[1],"votes":[true,true,false,false,false,true,false,true]},"passed":false},{"actual":{"isolated":[2],"votes":[false,true,true,false,true,true,true,false,true]},"check":"sampled regression 9","expected":{"isolated":[],"votes":[false,true,true,false,true,true,true,false,true]},"passed":false},{"actual":{"isolated":[],"votes":[true]},"check":"boundary: two healthy channels disagree","expected":{"isolated":[],"votes":[true]},"passed":true},{"actual":{"isolated":[],"votes":[false]},"check":"boundary: two healthy channels agree clear","expected":{"isolated":[],"votes":[false]},"passed":true},{"actual":{"isolated":[],"votes":[false,true,true,false]},"check":"control 1","expected":{"isolated":[],"votes":[false,true,true,false]},"passed":true},{"actual":{"isolated":[],"votes":[true,false,false,true,true,true,false,false,true]},"check":"control 4","expected":{"isolated":[],"votes":[true,false,false,true,true,true,false,false,true]},"passed":true},{"actual":{"isolated":[],"votes":[false,false,true,true,true,false,true,false]},"check":"control 7","expected":{"isolated":[],"votes":[false,false,true,true,true,false,true,false]},"passed":true}],"passed":false,"stderr":"","stdout":"{\"observations\": [{\"check\": \"regression: dissent interrupted by failure\", \"actual\": {\"votes\": [false, false, false], \"isolated\": [0]}, \"expected\": {\"votes\": [false, false, false], \"isolated\": []}, \"passed\": false}, {\"check\": \"sampled regression 10\", \"actual\": {\"votes\": [true, true, false, false, false, true, true, true], \"isolated\": [0, 1, 2]}, \"expected\": {\"votes\": [true, true, false, false, false, true, false, true], \"isolated\": [1]}, \"passed\": false}, {\"check\": \"sampled regression 9\", \"actual\": {\"votes\": [false, true, true, false, true, true, true, false, true], \"isolated\": [2]}, \"expected\": {\"votes\": [false, true, true, false, true, true, true, false, true], \"isolated\": []}, \"passed\": false}, {\"check\": \"boundary: two healthy channels disagree\", \"actual\": {\"votes\": [true], \"isolated\": []}, \"expected\": {\"votes\": [true], \"isolated\": []}, \"passed\": true}, {\"check\": \"boundary: two healthy channels agree clear\", \"actual\": {\"votes\": [false], \"isolated\": []}, \"expected\": {\"votes\": [false], \"isolated\": []}, \"passed\": true}, {\"check\": \"control 1\", \"actual\": {\"votes\": [false, true, true, false], \"isolated\": []}, \"expected\": {\"votes\": [false, true, true, false], \"isolated\": []}, \"passed\": true}, {\"check\": \"control 4\", \"actual\": {\"votes\": [true, false, false, true, true, true, false, false, true], \"isolated\": []}, \"expected\": {\"votes\": [true, false, false, true, true, true, false, false, true], \"isolated\": []}, \"passed\": true}, {\"check\": \"control 7\", \"actual\": {\"votes\": [false, false, true, true, true, false, true, false], \"isolated\": []}, \"expected\": {\"votes\": [false, false, true, true, true, false, true, false], \"isolated\": []}, \"passed\": true}], \"passed\": false}\n"},"fixed":{"elapsed_ms":45.752,"exit_code":0,"observations":[{"actual":{"isolated":[],"votes":[false,false,false]},"check":"regression: dissent interrupted by failure","expected":{"isolated":[],"votes":[false,false,false]},"passed":true},{"actual":{"isolated":[1],"votes":[true,true,false,false,false,true,false,true]},"check":"sampled regression 10","expected":{"isolated":[1],"votes":[true,true,false,false,false,true,false,true]},"passed":true},{"actual":{"isolated":[],"votes":[false,true,true,false,true,true,true,false,true]},"check":"sampled regression 9","expected":{"isolated":[],"votes":[false,true,true,false,true,true,true,false,true]},"passed":true},{"actual":{"isolated":[],"votes":[true]},"check":"boundary: two healthy channels disagree","expected":{"isolated":[],"votes":[true]},"passed":true},{"actual":{"isolated":[],"votes":[false]},"check":"boundary: two healthy channels agree clear","expected":{"isolated":[],"votes":[false]},"passed":true},{"actual":{"isolated":[],"votes":[false,true,true,false]},"check":"control 1","expected":{"isolated":[],"votes":[false,true,true,false]},"passed":true},{"actual":{"isolated":[],"votes":[true,false,false,true,true,true,false,false,true]},"check":"control 4","expected":{"isolated":[],"votes":[true,false,false,true,true,true,false,false,true]},"passed":true},{"actual":{"isolated":[],"votes":[false,false,true,true,true,false,true,false]},"check":"control 7","expected":{"isolated":[],"votes":[false,false,true,true,true,false,true,false]},"passed":true}],"passed":true,"stderr":"","stdout":"{\"observations\": [{\"check\": \"regression: dissent interrupted by failure\", \"actual\": {\"votes\": [false, false, false], \"isolated\": []}, \"expected\": {\"votes\": [false, false, false], \"isolated\": []}, \"passed\": true}, {\"check\": \"sampled regression 10\", \"actual\": {\"votes\": [true, true, false, false, false, true, false, true], \"isolated\": [1]}, \"expected\": {\"votes\": [true, true, false, false, false, true, false, true], \"isolated\": [1]}, \"passed\": true}, {\"check\": \"sampled regression 9\", \"actual\": {\"votes\": [false, true, true, false, true, true, true, false, true], \"isolated\": []}, \"expected\": {\"votes\": [false, true, true, false, true, true, true, false, true], \"isolated\": []}, \"passed\": true}, {\"check\": \"boundary: two healthy channels disagree\", \"actual\": {\"votes\": [true], \"isolated\": []}, \"expected\": {\"votes\": [true], \"isolated\": []}, \"passed\": true}, {\"check\": \"boundary: two healthy channels agree clear\", \"actual\": {\"votes\": [false], \"isolated\": []}, \"expected\": {\"votes\": [false], \"isolated\": []}, \"passed\": true}, {\"check\": \"control 1\", \"actual\": {\"votes\": [false, true, true, false], \"isolated\": []}, \"expected\": {\"votes\": [false, true, true, false], \"isolated\": []}, \"passed\": true}, {\"check\": \"control 4\", \"actual\": {\"votes\": [true, false, false, true, true, true, false, false, true], \"isolated\": []}, \"expected\": {\"votes\": [true, false, false, true, true, true, false, false, true], \"isolated\": []}, \"passed\": true}, {\"check\": \"control 7\", \"actual\": {\"votes\": [false, false, true, true, true, false, true, false], \"isolated\": []}, \"expected\": {\"votes\": [false, false, true, true, true, false, true, false], \"isolated\": []}, \"passed\": true}], \"passed\": true}\n"}},"verified":true,"visibility":"public"}