{"abstract":"Two healthy channels that disagree produce a clear vote.","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":"Forcing occupied whenever exactly two channels are healthy overrides two agreeing clear reports.","family":"w2-railway_interlocking_logic-two-out-of-three-voting-tie-resolution","id":"FA-67106","implementations":{"attempt":{"sha256":"fd01a19b02caff0fcf0c5e40d73bde38bf77583e5e759905362638134184f92b","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 or len(healthy) == 2\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: 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 2', {'isolate_after': 2, 'cycles': [[True, False, True], [None, True, False], [None, False, False], [False, None, False], [True, False, False], [True, False, True]]}, {'votes': [True, True, False, False, False, True], 'isolated': []}), ('boundary: persistent dissenter', {'isolate_after': 2, 'cycles': [[True, False, False], [True, False, False], [False, False, False]]}, {'votes': [False, False, False], 'isolated': [0]}), ('boundary: single healthy channel says clear', {'isolate_after': 3, 'cycles': [[False, None, None]]}, {'votes': [True], '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: 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: persistent dissenter', {'isolate_after': 2, 'cycles': [[True, False, False], [True, False, False], [False, False, False]]}, {'votes': [False, False, False], 'isolated': [0]}), ('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': []}), ('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': []}), ('boundary: single healthy channel says clear', {'isolate_after': 3, 'cycles': [[False, None, None]]}, {'votes': [True], 'isolated': []}), ('sampled regression 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]}), ('sampled regression 15', {'isolate_after': 3, 'cycles': [[False, False, False], [False, None, False], [True, False, False], [True, None, False]]}, {'votes': [False, False, False, True], 'isolated': []}), ('control 21', {'isolate_after': 3, 'cycles': [[True, True, True], [False, True, False], [True, True, True], [True, True, False], [None, False, False], [False, False, False], [False, False, False]]}, {'votes': [True, False, True, True, False, False, False], 'isolated': []})], [('regression: isolated channel keeps reporting', {'isolate_after': 1, 'cycles': [[True, False, False], [True, True, False]]}, {'votes': [False, True], 'isolated': [0, 2]}), ('boundary: dissent interrupted by failure', {'isolate_after': 2, 'cycles': [[True, False, False], [None, False, False], [True, False, False]]}, {'votes': [False, False, False], 'isolated': []}), ('sampled regression 42', {'isolate_after': 3, 'cycles': [[False, False, False], [True, False, False], [False, False, False], [False, False, True], [False, True, False], [False, False, True], [None, False, False], [True, None, False], [False, True, True]]}, {'votes': [False, False, False, False, False, False, False, True, True], 'isolated': []}), ('control 13', {'isolate_after': 3, 'cycles': [[False, False, False], [True, None, True], [True, True, True], [False, None, False], [False, False, True]]}, {'votes': [False, True, True, False, False], 'isolated': []}), ('regression: 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]}), ('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': []}), ('control 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: 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 56', {'isolate_after': 2, 'cycles': [[False, True, None], [False, True, None], [False, False, False], [True, False, False], [False, False, True]]}, {'votes': [True, True, False, False, True], 'isolated': [0]}), ('control 21', {'isolate_after': 3, 'cycles': [[True, True, True], [False, True, False], [True, True, True], [True, True, False], [None, False, False], [False, False, False], [False, False, False]]}, {'votes': [True, False, True, True, False, False, False], 'isolated': []}), ('regression: isolated channel keeps reporting', {'isolate_after': 1, 'cycles': [[True, False, False], [True, True, False]]}, {'votes': [False, True], 'isolated': [0, 2]}), ('control 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': []}), ('sampled regression 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: 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: persistent dissenter', {'isolate_after': 2, 'cycles': [[True, False, False], [True, False, False], [False, False, False]]}, {'votes': [False, False, False], 'isolated': [0]}), ('sampled regression 69', {'isolate_after': 3, 'cycles': [[False, True, True], [True, True, False], [False, False, False], [False, None, True]]}, {'votes': [True, True, False, True], 'isolated': []}), ('control 32', {'isolate_after': 3, 'cycles': [[False, True, True], [False, False, False], [False, False, None], [True, True, None], [False, False, False], [True, True, False], [True, None, True]]}, {'votes': [True, False, False, True, False, True, True], 'isolated': []}), ('boundary: two healthy channels agree clear', {'isolate_after': 3, 'cycles': [[False, False, None]]}, {'votes': [False], '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]}), ('control 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":"9972e3971d1df23d5055deb221de6d3ad2e7b166a1dc05285e19ba841aadb85e","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: 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 2', {'isolate_after': 2, 'cycles': [[True, False, True], [None, True, False], [None, False, False], [False, None, False], [True, False, False], [True, False, True]]}, {'votes': [True, True, False, False, False, True], 'isolated': []}), ('boundary: persistent dissenter', {'isolate_after': 2, 'cycles': [[True, False, False], [True, False, False], [False, False, False]]}, {'votes': [False, False, False], 'isolated': [0]}), ('boundary: single healthy channel says clear', {'isolate_after': 3, 'cycles': [[False, None, None]]}, {'votes': [True], '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: 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: persistent dissenter', {'isolate_after': 2, 'cycles': [[True, False, False], [True, False, False], [False, False, False]]}, {'votes': [False, False, False], 'isolated': [0]}), ('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': []}), ('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': []}), ('boundary: single healthy channel says clear', {'isolate_after': 3, 'cycles': [[False, None, None]]}, {'votes': [True], 'isolated': []}), ('sampled regression 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]}), ('sampled regression 15', {'isolate_after': 3, 'cycles': [[False, False, False], [False, None, False], [True, False, False], [True, None, False]]}, {'votes': [False, False, False, True], 'isolated': []}), ('control 21', {'isolate_after': 3, 'cycles': [[True, True, True], [False, True, False], [True, True, True], [True, True, False], [None, False, False], [False, False, False], [False, False, False]]}, {'votes': [True, False, True, True, False, False, False], 'isolated': []})], [('regression: isolated channel keeps reporting', {'isolate_after': 1, 'cycles': [[True, False, False], [True, True, False]]}, {'votes': [False, True], 'isolated': [0, 2]}), ('boundary: dissent interrupted by failure', {'isolate_after': 2, 'cycles': [[True, False, False], [None, False, False], [True, False, False]]}, {'votes': [False, False, False], 'isolated': []}), ('sampled regression 42', {'isolate_after': 3, 'cycles': [[False, False, False], [True, False, False], [False, False, False], [False, False, True], [False, True, False], [False, False, True], [None, False, False], [True, None, False], [False, True, True]]}, {'votes': [False, False, False, False, False, False, False, True, True], 'isolated': []}), ('control 13', {'isolate_after': 3, 'cycles': [[False, False, False], [True, None, True], [True, True, True], [False, None, False], [False, False, True]]}, {'votes': [False, True, True, False, False], 'isolated': []}), ('regression: 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]}), ('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': []}), ('control 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: 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 56', {'isolate_after': 2, 'cycles': [[False, True, None], [False, True, None], [False, False, False], [True, False, False], [False, False, True]]}, {'votes': [True, True, False, False, True], 'isolated': [0]}), ('control 21', {'isolate_after': 3, 'cycles': [[True, True, True], [False, True, False], [True, True, True], [True, True, False], [None, False, False], [False, False, False], [False, False, False]]}, {'votes': [True, False, True, True, False, False, False], 'isolated': []}), ('regression: isolated channel keeps reporting', {'isolate_after': 1, 'cycles': [[True, False, False], [True, True, False]]}, {'votes': [False, True], 'isolated': [0, 2]}), ('control 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': []}), ('sampled regression 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: 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: persistent dissenter', {'isolate_after': 2, 'cycles': [[True, False, False], [True, False, False], [False, False, False]]}, {'votes': [False, False, False], 'isolated': [0]}), ('sampled regression 69', {'isolate_after': 3, 'cycles': [[False, True, True], [True, True, False], [False, False, False], [False, None, True]]}, {'votes': [True, True, False, True], 'isolated': []}), ('control 32', {'isolate_after': 3, 'cycles': [[False, True, True], [False, False, False], [False, False, None], [True, True, None], [False, False, False], [True, True, False], [True, None, True]]}, {'votes': [True, False, False, True, False, True, True], 'isolated': []}), ('boundary: two healthy channels agree clear', {'isolate_after': 3, 'cycles': [[False, False, None]]}, {'votes': [False], '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]}), ('control 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":"6514bf02ab7ea36812de96e28c3ebd93c8c8a671e3cb994a76b314d1aa73da6a","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: 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 2', {'isolate_after': 2, 'cycles': [[True, False, True], [None, True, False], [None, False, False], [False, None, False], [True, False, False], [True, False, True]]}, {'votes': [True, True, False, False, False, True], 'isolated': []}), ('boundary: persistent dissenter', {'isolate_after': 2, 'cycles': [[True, False, False], [True, False, False], [False, False, False]]}, {'votes': [False, False, False], 'isolated': [0]}), ('boundary: single healthy channel says clear', {'isolate_after': 3, 'cycles': [[False, None, None]]}, {'votes': [True], '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: 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: persistent dissenter', {'isolate_after': 2, 'cycles': [[True, False, False], [True, False, False], [False, False, False]]}, {'votes': [False, False, False], 'isolated': [0]}), ('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': []}), ('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': []}), ('boundary: single healthy channel says clear', {'isolate_after': 3, 'cycles': [[False, None, None]]}, {'votes': [True], 'isolated': []}), ('sampled regression 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]}), ('sampled regression 15', {'isolate_after': 3, 'cycles': [[False, False, False], [False, None, False], [True, False, False], [True, None, False]]}, {'votes': [False, False, False, True], 'isolated': []}), ('control 21', {'isolate_after': 3, 'cycles': [[True, True, True], [False, True, False], [True, True, True], [True, True, False], [None, False, False], [False, False, False], [False, False, False]]}, {'votes': [True, False, True, True, False, False, False], 'isolated': []})], [('regression: isolated channel keeps reporting', {'isolate_after': 1, 'cycles': [[True, False, False], [True, True, False]]}, {'votes': [False, True], 'isolated': [0, 2]}), ('boundary: dissent interrupted by failure', {'isolate_after': 2, 'cycles': [[True, False, False], [None, False, False], [True, False, False]]}, {'votes': [False, False, False], 'isolated': []}), ('sampled regression 42', {'isolate_after': 3, 'cycles': [[False, False, False], [True, False, False], [False, False, False], [False, False, True], [False, True, False], [False, False, True], [None, False, False], [True, None, False], [False, True, True]]}, {'votes': [False, False, False, False, False, False, False, True, True], 'isolated': []}), ('control 13', {'isolate_after': 3, 'cycles': [[False, False, False], [True, None, True], [True, True, True], [False, None, False], [False, False, True]]}, {'votes': [False, True, True, False, False], 'isolated': []}), ('regression: 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]}), ('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': []}), ('control 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: 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 56', {'isolate_after': 2, 'cycles': [[False, True, None], [False, True, None], [False, False, False], [True, False, False], [False, False, True]]}, {'votes': [True, True, False, False, True], 'isolated': [0]}), ('control 21', {'isolate_after': 3, 'cycles': [[True, True, True], [False, True, False], [True, True, True], [True, True, False], [None, False, False], [False, False, False], [False, False, False]]}, {'votes': [True, False, True, True, False, False, False], 'isolated': []}), ('regression: isolated channel keeps reporting', {'isolate_after': 1, 'cycles': [[True, False, False], [True, True, False]]}, {'votes': [False, True], 'isolated': [0, 2]}), ('control 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': []}), ('sampled regression 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: 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: persistent dissenter', {'isolate_after': 2, 'cycles': [[True, False, False], [True, False, False], [False, False, False]]}, {'votes': [False, False, False], 'isolated': [0]}), ('sampled regression 69', {'isolate_after': 3, 'cycles': [[False, True, True], [True, True, False], [False, False, False], [False, None, True]]}, {'votes': [True, True, False, True], 'isolated': []}), ('control 32', {'isolate_after': 3, 'cycles': [[False, True, True], [False, False, False], [False, False, None], [True, True, None], [False, False, False], [True, True, False], [True, None, True]]}, {'votes': [True, False, False, True, False, True, True], 'isolated': []}), ('boundary: two healthy channels agree clear', {'isolate_after': 3, 'cycles': [[False, False, None]]}, {'votes': [False], '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]}), ('control 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-tie-resolution","generated_at":"2026-09-29T14:47:49.828215+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":"Resolve ties towards occupied.","root_cause":"A tie between occupied and clear is resolved towards clear.","sha256":"564f497097c66ca59e3e0d1202bf12a5892a4a00a917182848a4bdd103adc2e0","title":"Two-out-of-three occupancy voting: tie resolution · case 01","variant":1,"variant_policy":"Five numbered records share a model and may reuse boundary fixtures.","verification":{"attempt":{"elapsed_ms":37.957,"exit_code":1,"observations":[{"actual":{"isolated":[],"votes":[true]},"check":"regression: two healthy channels disagree","expected":{"isolated":[],"votes":[true]},"passed":true},{"actual":{"isolated":[],"votes":[true]},"check":"boundary: two healthy channels agree clear","expected":{"isolated":[],"votes":[false]},"passed":false},{"actual":{"isolated":[1,2],"votes":[true,true,true,true,true,true]},"check":"sampled regression 2","expected":{"isolated":[],"votes":[true,true,false,false,false,true]},"passed":false},{"actual":{"isolated":[0],"votes":[false,false,true]},"check":"boundary: persistent dissenter","expected":{"isolated":[0],"votes":[false,false,false]},"passed":false},{"actual":{"isolated":[],"votes":[true]},"check":"boundary: single healthy channel says clear","expected":{"isolated":[],"votes":[true]},"passed":true},{"actual":{"isolated":[],"votes":[false,true,true,true]},"check":"control 1","expected":{"isolated":[],"votes":[false,true,true,false]},"passed":false},{"actual":{"isolated":[],"votes":[true,false,false,true,true,true,false,true,true]},"check":"control 4","expected":{"isolated":[],"votes":[true,false,false,true,true,true,false,false,true]},"passed":false},{"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: two healthy channels disagree\", \"actual\": {\"votes\": [true], \"isolated\": []}, \"expected\": {\"votes\": [true], \"isolated\": []}, \"passed\": true}, {\"check\": \"boundary: two healthy channels agree clear\", \"actual\": {\"votes\": [true], \"isolated\": []}, \"expected\": {\"votes\": [false], \"isolated\": []}, \"passed\": false}, {\"check\": \"sampled regression 2\", \"actual\": {\"votes\": [true, true, true, true, true, true], \"isolated\": [1, 2]}, \"expected\": {\"votes\": [true, true, false, false, false, true], \"isolated\": []}, \"passed\": false}, {\"check\": \"boundary: persistent dissenter\", \"actual\": {\"votes\": [false, false, true], \"isolated\": [0]}, \"expected\": {\"votes\": [false, false, false], \"isolated\": [0]}, \"passed\": false}, {\"check\": \"boundary: single healthy channel says clear\", \"actual\": {\"votes\": [true], \"isolated\": []}, \"expected\": {\"votes\": [true], \"isolated\": []}, \"passed\": true}, {\"check\": \"control 1\", \"actual\": {\"votes\": [false, true, true, true], \"isolated\": []}, \"expected\": {\"votes\": [false, true, true, false], \"isolated\": []}, \"passed\": false}, {\"check\": \"control 4\", \"actual\": {\"votes\": [true, false, false, true, true, true, false, true, true], \"isolated\": []}, \"expected\": {\"votes\": [true, false, false, true, true, true, false, false, true], \"isolated\": []}, \"passed\": false}, {\"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":39.892,"exit_code":1,"observations":[{"actual":{"isolated":[],"votes":[false]},"check":"regression: two healthy channels disagree","expected":{"isolated":[],"votes":[true]},"passed":false},{"actual":{"isolated":[],"votes":[false]},"check":"boundary: two healthy channels agree clear","expected":{"isolated":[],"votes":[false]},"passed":true},{"actual":{"isolated":[1],"votes":[true,false,true,false,false,true]},"check":"sampled regression 2","expected":{"isolated":[],"votes":[true,true,false,false,false,true]},"passed":false},{"actual":{"isolated":[0],"votes":[false,false,false]},"check":"boundary: persistent dissenter","expected":{"isolated":[0],"votes":[false,false,false]},"passed":true},{"actual":{"isolated":[],"votes":[true]},"check":"boundary: single healthy channel says clear","expected":{"isolated":[],"votes":[true]},"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: two healthy channels disagree\", \"actual\": {\"votes\": [false], \"isolated\": []}, \"expected\": {\"votes\": [true], \"isolated\": []}, \"passed\": false}, {\"check\": \"boundary: two healthy channels agree clear\", \"actual\": {\"votes\": [false], \"isolated\": []}, \"expected\": {\"votes\": [false], \"isolated\": []}, \"passed\": true}, {\"check\": \"sampled regression 2\", \"actual\": {\"votes\": [true, false, true, false, false, true], \"isolated\": [1]}, \"expected\": {\"votes\": [true, true, false, false, false, true], \"isolated\": []}, \"passed\": false}, {\"check\": \"boundary: persistent dissenter\", \"actual\": {\"votes\": [false, false, false], \"isolated\": [0]}, \"expected\": {\"votes\": [false, false, false], \"isolated\": [0]}, \"passed\": true}, {\"check\": \"boundary: single healthy channel says clear\", \"actual\": {\"votes\": [true], \"isolated\": []}, \"expected\": {\"votes\": [true], \"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":40.712,"exit_code":0,"observations":[{"actual":{"isolated":[],"votes":[true]},"check":"regression: 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":[true,true,false,false,false,true]},"check":"sampled regression 2","expected":{"isolated":[],"votes":[true,true,false,false,false,true]},"passed":true},{"actual":{"isolated":[0],"votes":[false,false,false]},"check":"boundary: persistent dissenter","expected":{"isolated":[0],"votes":[false,false,false]},"passed":true},{"actual":{"isolated":[],"votes":[true]},"check":"boundary: single healthy channel says clear","expected":{"isolated":[],"votes":[true]},"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: 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\": \"sampled regression 2\", \"actual\": {\"votes\": [true, true, false, false, false, true], \"isolated\": []}, \"expected\": {\"votes\": [true, true, false, false, false, true], \"isolated\": []}, \"passed\": true}, {\"check\": \"boundary: persistent dissenter\", \"actual\": {\"votes\": [false, false, false], \"isolated\": [0]}, \"expected\": {\"votes\": [false, false, false], \"isolated\": [0]}, \"passed\": true}, {\"check\": \"boundary: single healthy channel says clear\", \"actual\": {\"votes\": [true], \"isolated\": []}, \"expected\": {\"votes\": [true], \"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"}