{"abstract":"Alphabetic filtering admits combining letter numbers.","category":"Unicode","checks":4,"contract":"Keep only Unicode characters whose general category starts with L.","evaluation_group":"model-87aec2a39c4b1c72","failed_approach":"The attempted repair handles the primary example but still violates a separate boundary of the same contract.","family":"xp-category-letter","id":"FA-2916","implementations":{"attempt":{"sha256":"84151a5ced90b3d1c295015b2610ca24a08cd506365b3ed5c01a0505e5b0ef90","source":"\"\"\"Failure Map reference implementation. Python standard library only.\"\"\"\nimport json\nimport re, unicodedata, json, csv, io, html, base64, binascii, codecs, struct\nfrom urllib.parse import quote, unquote, unquote_to_bytes, urlencode, parse_qsl, urlsplit, urlunsplit\nfrom email.header import decode_header, make_header\nfrom email.utils import getaddresses\nfrom xml.etree import ElementTree as ET\nimport shlex, string, textwrap\n\nN = 1\nobservations = []\ndef solve(x):\n    try:\n        return ''.join(c for c in x if c.isalpha() or c.isnumeric())\n    except Exception as exc:\n        return {\"error\": type(exc).__name__}\ndef check(label, actual, expected):\n    observations.append({\"check\": label, \"actual\": actual, \"expected\": expected, \"passed\": actual == expected})\ncheck('boundary 1', solve('A1Ⅳ'), 'A')\ncheck('boundary 2', solve('中é'), '中é')\ncheck('boundary 3', solve('á'), 'a')\ncheck('boundary 4', solve(''), '')\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":"ad14604724c131356bdaee3e010541d10d5d5e03eda4b882811242182a7c9b8e","source":"\"\"\"Failure Map reference implementation. Python standard library only.\"\"\"\nimport json\nimport re, unicodedata, json, csv, io, html, base64, binascii, codecs, struct\nfrom urllib.parse import quote, unquote, unquote_to_bytes, urlencode, parse_qsl, urlsplit, urlunsplit\nfrom email.header import decode_header, make_header\nfrom email.utils import getaddresses\nfrom xml.etree import ElementTree as ET\nimport shlex, string, textwrap\n\nN = 1\nobservations = []\ndef solve(x):\n    try:\n        return ''.join(c for c in x if c.isalnum())\n    except Exception as exc:\n        return {\"error\": type(exc).__name__}\ndef check(label, actual, expected):\n    observations.append({\"check\": label, \"actual\": actual, \"expected\": expected, \"passed\": actual == expected})\ncheck('boundary 1', solve('A1Ⅳ'), 'A')\ncheck('boundary 2', solve('中é'), '中é')\ncheck('boundary 3', solve('á'), 'a')\ncheck('boundary 4', solve(''), '')\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":"05e81c60e0b77c006124214acb7aac28a7b59af3dcfd40f2e0daacd2c5f475fe","source":"\"\"\"Failure Map reference implementation. Python standard library only.\"\"\"\nimport json\nimport re, unicodedata, json, csv, io, html, base64, binascii, codecs, struct\nfrom urllib.parse import quote, unquote, unquote_to_bytes, urlencode, parse_qsl, urlsplit, urlunsplit\nfrom email.header import decode_header, make_header\nfrom email.utils import getaddresses\nfrom xml.etree import ElementTree as ET\nimport shlex, string, textwrap\n\nN = 1\nobservations = []\ndef solve(x):\n    try:\n        return ''.join(c for c in x if unicodedata.category(c).startswith('L'))\n    except Exception as exc:\n        return {\"error\": type(exc).__name__}\ndef check(label, actual, expected):\n    observations.append({\"check\": label, \"actual\": actual, \"expected\": expected, \"passed\": actual == expected})\ncheck('boundary 1', solve('A1Ⅳ'), 'A')\ncheck('boundary 2', solve('中é'), '中é')\ncheck('boundary 3', solve('á'), 'a')\ncheck('boundary 4', solve(''), '')\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":" 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":"xp-category-letter","generated_at":"2026-09-29T14:37:18.853974+00:00","license":"CC0-1.0","python":"3.12.14","seed":1,"split":"open-access"},"relevance":"A local executable model for consumers of structured text; oracle values are authored literals, not outputs copied from the repaired implementation.","repair":"Implement the complete stated contract, including the boundary fixtures: Keep only Unicode characters whose general category starts with L.","root_cause":"The implementation applies an operation whose text or grammar semantics violate this contract: Keep only Unicode characters whose general category starts with L.","sha256":"8403b21c9b52283341149cc81879680b9c447b533b8c95d5bce1d457838c61cd","title":"Alphabetic filtering admits combining letter numbers · case 01","variant":1,"variant_policy":"Five numbered records share a model and may reuse boundary fixtures.","verification":{"attempt":{"elapsed_ms":55.127,"exit_code":1,"observations":[{"actual":"A1Ⅳ","check":"boundary 1","expected":"A","passed":false},{"actual":"中é","check":"boundary 2","expected":"中é","passed":true},{"actual":"a","check":"boundary 3","expected":"a","passed":true},{"actual":"","check":"boundary 4","expected":"","passed":true}],"passed":false,"stderr":"","stdout":"{\"observations\": [{\"check\": \"boundary 1\", \"actual\": \"A1Ⅳ\", \"expected\": \"A\", \"passed\": false}, {\"check\": \"boundary 2\", \"actual\": \"中é\", \"expected\": \"中é\", \"passed\": true}, {\"check\": \"boundary 3\", \"actual\": \"a\", \"expected\": \"a\", \"passed\": true}, {\"check\": \"boundary 4\", \"actual\": \"\", \"expected\": \"\", \"passed\": true}], \"passed\": false}\n"},"broken":{"elapsed_ms":54.919,"exit_code":1,"observations":[{"actual":"A1Ⅳ","check":"boundary 1","expected":"A","passed":false},{"actual":"中é","check":"boundary 2","expected":"中é","passed":true},{"actual":"a","check":"boundary 3","expected":"a","passed":true},{"actual":"","check":"boundary 4","expected":"","passed":true}],"passed":false,"stderr":"","stdout":"{\"observations\": [{\"check\": \"boundary 1\", \"actual\": \"A1Ⅳ\", \"expected\": \"A\", \"passed\": false}, {\"check\": \"boundary 2\", \"actual\": \"中é\", \"expected\": \"中é\", \"passed\": true}, {\"check\": \"boundary 3\", \"actual\": \"a\", \"expected\": \"a\", \"passed\": true}, {\"check\": \"boundary 4\", \"actual\": \"\", \"expected\": \"\", \"passed\": true}], \"passed\": false}\n"},"fixed":{"elapsed_ms":52.677,"exit_code":0,"observations":[{"actual":"A","check":"boundary 1","expected":"A","passed":true},{"actual":"中é","check":"boundary 2","expected":"中é","passed":true},{"actual":"a","check":"boundary 3","expected":"a","passed":true},{"actual":"","check":"boundary 4","expected":"","passed":true}],"passed":true,"stderr":"","stdout":"{\"observations\": [{\"check\": \"boundary 1\", \"actual\": \"A\", \"expected\": \"A\", \"passed\": true}, {\"check\": \"boundary 2\", \"actual\": \"中é\", \"expected\": \"中é\", \"passed\": true}, {\"check\": \"boundary 3\", \"actual\": \"a\", \"expected\": \"a\", \"passed\": true}, {\"check\": \"boundary 4\", \"actual\": \"\", \"expected\": \"\", \"passed\": true}], \"passed\": true}\n"}},"verified":true,"visibility":"public"}