{"abstract":"A one-character string on a two-qubit state returns a number instead of \"length-mismatch\".","category":"Quantum circuit simulation","checks":7,"contract":"Input [n, amps, pauli]; pauli is an n-character string over I,X,Y,Z whose rightmost character acts on qubit 0 (LSB). Return the real expectation <psi|P|psi>/<psi|psi> rounded to 6 decimals. Errors: \"length-mismatch\", \"bad-pauli\" (any character outside uppercase IXYZ).","evaluation_group":"w2-quantum_circuit_simulation-pauli-expectation","failed_approach":"The attempted repair only adds a guard for the empty string, so non-empty short strings are still evaluated on the high qubits alone.","family":"w2-quantum_circuit_simulation-pauli-expectation-string-length-validation","id":"FA-90951","implementations":{"attempt":{"sha256":"d32d68050052dea87a36d08c02087ee0c8efb2da03307d8eede43176a8c4759b","source":"\"\"\"Failure Map reference implementation. Python standard library only.\"\"\"\nimport json\nimport math\nN = 1\nobservations = []\ndef solve(x):\n    n, amps, pauli = x\n    if len(pauli) > n or not pauli:\n        return 'length-mismatch'\n    if any(c not in 'IXYZ' for c in pauli):\n        return 'bad-pauli'\n    psi = [complex(a, b) for a, b in amps]\n    acc = 0j\n    for i, v in enumerate(psi):\n        j = i\n        phase = 1 + 0j\n        for k, c in enumerate(pauli):\n            q = n - 1 - k\n            bit = (i >> q) & 1\n            if c in 'XY':\n                j ^= 1 << q\n            if c == 'Z' and bit:\n                phase = -phase\n            elif c == 'Y':\n                phase *= 1j if bit == 0 else -1j\n        acc += psi[j].conjugate() * phase * v\n    norm = sum(abs(v) ** 2 for v in psi)\n    return round((acc / norm).real, 6) + 0.0\ndef check(label, actual, expected):\n    observations.append({\"check\": label, \"actual\": actual, \"expected\": expected, \"passed\": actual == expected})\nfixtures = [[['regression: short string', [2, [[1, 0], [0, 0], [0, 0], [0, 0]], 'Z'], 'length-mismatch'], ['regression: short X on bell', [2, [[0.707107, 0], [0, 0], [0, 0], [0.707107, 0]], 'X'], 'length-mismatch'], ['regression: short Y on three qubits', [3, [[0.5, 0], [0, 0.5], [0, 0], [0.5, 0], [0, 0], [0, 0], [0, 0], [0.5, 0]], 'YZ'], 'length-mismatch'], ['control: ZI on |01>', [2, [[0, 0], [1, 0], [0, 0], [0, 0]], 'ZI'], 1.0], ['control: IZ on |01>', [2, [[0, 0], [1, 0], [0, 0], [0, 0]], 'IZ'], -1.0], ['control: Y on |+i>', [1, [[0.707107, 0], [0, 0.707107]], 'Y'], 1.0], ['control: X on |+>', [1, [[0.707107, 0], [0.707107, 0]], 'X'], 1.0]], [['regression: short Z on excited high qubit', [2, [[0, 0], [0, 0], [1, 0], [0, 0]], 'Z'], 'length-mismatch'], ['regression: short ZX', [3, [[0.6, 0], [0.8, 0], [0, 0], [0, 0], [0, 0], [0, 0], [0, 0], [0, 0]], 'ZX'], 'length-mismatch'], ['regression: short Y on three qubits', [3, [[0.5, 0], [0, 0.5], [0, 0], [0.5, 0], [0, 0], [0, 0], [0, 0], [0.5, 0]], 'YZ'], 'length-mismatch'], ['control: long string', [1, [[1, 0], [0, 0]], 'ZZ'], 'length-mismatch'], ['control: lowercase pauli', [1, [[1, 0], [0, 0]], 'z'], 'bad-pauli'], ['control: unnormalized Z', [1, [[3, 0], [0, 4]], 'Z'], -0.28], ['control: random expectation 0', [1, [[0.071, 0.727], [-1.619, -1.464]], 'I'], 1.0]], [['regression: short X on bell', [2, [[0.707107, 0], [0, 0], [0, 0], [0.707107, 0]], 'X'], 'length-mismatch'], ['regression: short Y on three qubits', [3, [[0.5, 0], [0, 0.5], [0, 0], [0.5, 0], [0, 0], [0, 0], [0, 0], [0.5, 0]], 'YZ'], 'length-mismatch'], ['regression: short ZX', [3, [[0.6, 0], [0.8, 0], [0, 0], [0, 0], [0, 0], [0, 0], [0, 0], [0, 0]], 'ZX'], 'length-mismatch'], ['control: random expectation 1', [1, [[0.0, 0.0], [1.97, 0.65]], 'X'], 0.0], ['control: random expectation 2', [1, [[0.489, 0.112], [-0.446, 0.868]], 'X'], -0.200793], ['control: random expectation 3', [1, [[-0.119, -0.141], [0.0, 0.0]], 'Z'], 1.0], ['control: random expectation 4', [1, [[-0.408, 0.461], [-0.359, 0.326]], 'Y'], 0.105809]], [['regression: short ZX', [3, [[0.6, 0], [0.8, 0], [0, 0], [0, 0], [0, 0], [0, 0], [0, 0], [0, 0]], 'ZX'], 'length-mismatch'], ['regression: short string', [2, [[1, 0], [0, 0], [0, 0], [0, 0]], 'Z'], 'length-mismatch'], ['regression: short X on bell', [2, [[0.707107, 0], [0, 0], [0, 0], [0.707107, 0]], 'X'], 'length-mismatch'], ['control: random expectation 5', [3, [[0.616, -0.07], [-0.126, -0.492], [-0.385, 0.046], [-0.714, -0.852], [0.968, -0.035], [-0.129, -0.794], [-0.299, 0.172], [0.772, -0.916]], 'YYZ'], -0.229604], ['control: random expectation 6', [2, [[0.423, -0.627], [-0.829, 0.103], [0.962, -0.142], [-0.494, -0.183]], 'XX'], -0.7271], ['control: random expectation 7', [1, [[-1.206, 1.877], [0.69, -0.341]], 'I'], 1.0], ['control: random expectation 8', [1, [[0.52, 0.586], [-0.138, -0.781]], 'I'], 1.0]], [['regression: short Y on three qubits', [3, [[0.5, 0], [0, 0.5], [0, 0], [0.5, 0], [0, 0], [0, 0], [0, 0], [0.5, 0]], 'YZ'], 'length-mismatch'], ['regression: short Z on excited high qubit', [2, [[0, 0], [0, 0], [1, 0], [0, 0]], 'Z'], 'length-mismatch'], ['regression: short ZX', [3, [[0.6, 0], [0.8, 0], [0, 0], [0, 0], [0, 0], [0, 0], [0, 0], [0, 0]], 'ZX'], 'length-mismatch'], ['control: random expectation 9', [3, [[0.685, -0.091], [1.56, 1.459], [-1.17, 0.687], [-0.305, 1.609], [-0.876, -1.673], [-0.535, 0.008], [-1.818, 1.331], [1.693, 1.162]], 'IXI'], -0.046053], ['control: random expectation 10', [3, [[0.0, 0.0], [1.545, 0.342], [0.0, 0.0], [-1.862, -1.433], [0.0, 0.0], [-0.66, -1.507], [0.913, -1.017], [-1.982, -0.009]], 'IZX'], 0.21787], ['control: random expectation 11', [1, [[-0.422, -1.932], [-1.435, 1.833]], 'Z'], -0.161676], ['control: random expectation 12', [3, [[1.741, 0.945], [0.0, 0.0], [0.705, -0.271], [0.0, 0.0], [0.0, 0.0], [0.0, 0.0], [-1.277, -0.575], [-0.732, 0.787]], 'ZZX'], 0.12672]]]\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":"b4a1b0be326256a30592c33068d8235aed931b5a4c6a5dc87b573c28ac40def3","source":"\"\"\"Failure Map reference implementation. Python standard library only.\"\"\"\nimport json\nimport math\nN = 1\nobservations = []\ndef solve(x):\n    n, amps, pauli = x\n    if len(pauli) > n:\n        return 'length-mismatch'\n    if any(c not in 'IXYZ' for c in pauli):\n        return 'bad-pauli'\n    psi = [complex(a, b) for a, b in amps]\n    acc = 0j\n    for i, v in enumerate(psi):\n        j = i\n        phase = 1 + 0j\n        for k, c in enumerate(pauli):\n            q = n - 1 - k\n            bit = (i >> q) & 1\n            if c in 'XY':\n                j ^= 1 << q\n            if c == 'Z' and bit:\n                phase = -phase\n            elif c == 'Y':\n                phase *= 1j if bit == 0 else -1j\n        acc += psi[j].conjugate() * phase * v\n    norm = sum(abs(v) ** 2 for v in psi)\n    return round((acc / norm).real, 6) + 0.0\ndef check(label, actual, expected):\n    observations.append({\"check\": label, \"actual\": actual, \"expected\": expected, \"passed\": actual == expected})\nfixtures = [[['regression: short string', [2, [[1, 0], [0, 0], [0, 0], [0, 0]], 'Z'], 'length-mismatch'], ['regression: short X on bell', [2, [[0.707107, 0], [0, 0], [0, 0], [0.707107, 0]], 'X'], 'length-mismatch'], ['regression: short Y on three qubits', [3, [[0.5, 0], [0, 0.5], [0, 0], [0.5, 0], [0, 0], [0, 0], [0, 0], [0.5, 0]], 'YZ'], 'length-mismatch'], ['control: ZI on |01>', [2, [[0, 0], [1, 0], [0, 0], [0, 0]], 'ZI'], 1.0], ['control: IZ on |01>', [2, [[0, 0], [1, 0], [0, 0], [0, 0]], 'IZ'], -1.0], ['control: Y on |+i>', [1, [[0.707107, 0], [0, 0.707107]], 'Y'], 1.0], ['control: X on |+>', [1, [[0.707107, 0], [0.707107, 0]], 'X'], 1.0]], [['regression: short Z on excited high qubit', [2, [[0, 0], [0, 0], [1, 0], [0, 0]], 'Z'], 'length-mismatch'], ['regression: short ZX', [3, [[0.6, 0], [0.8, 0], [0, 0], [0, 0], [0, 0], [0, 0], [0, 0], [0, 0]], 'ZX'], 'length-mismatch'], ['regression: short Y on three qubits', [3, [[0.5, 0], [0, 0.5], [0, 0], [0.5, 0], [0, 0], [0, 0], [0, 0], [0.5, 0]], 'YZ'], 'length-mismatch'], ['control: long string', [1, [[1, 0], [0, 0]], 'ZZ'], 'length-mismatch'], ['control: lowercase pauli', [1, [[1, 0], [0, 0]], 'z'], 'bad-pauli'], ['control: unnormalized Z', [1, [[3, 0], [0, 4]], 'Z'], -0.28], ['control: random expectation 0', [1, [[0.071, 0.727], [-1.619, -1.464]], 'I'], 1.0]], [['regression: short X on bell', [2, [[0.707107, 0], [0, 0], [0, 0], [0.707107, 0]], 'X'], 'length-mismatch'], ['regression: short Y on three qubits', [3, [[0.5, 0], [0, 0.5], [0, 0], [0.5, 0], [0, 0], [0, 0], [0, 0], [0.5, 0]], 'YZ'], 'length-mismatch'], ['regression: short ZX', [3, [[0.6, 0], [0.8, 0], [0, 0], [0, 0], [0, 0], [0, 0], [0, 0], [0, 0]], 'ZX'], 'length-mismatch'], ['control: random expectation 1', [1, [[0.0, 0.0], [1.97, 0.65]], 'X'], 0.0], ['control: random expectation 2', [1, [[0.489, 0.112], [-0.446, 0.868]], 'X'], -0.200793], ['control: random expectation 3', [1, [[-0.119, -0.141], [0.0, 0.0]], 'Z'], 1.0], ['control: random expectation 4', [1, [[-0.408, 0.461], [-0.359, 0.326]], 'Y'], 0.105809]], [['regression: short ZX', [3, [[0.6, 0], [0.8, 0], [0, 0], [0, 0], [0, 0], [0, 0], [0, 0], [0, 0]], 'ZX'], 'length-mismatch'], ['regression: short string', [2, [[1, 0], [0, 0], [0, 0], [0, 0]], 'Z'], 'length-mismatch'], ['regression: short X on bell', [2, [[0.707107, 0], [0, 0], [0, 0], [0.707107, 0]], 'X'], 'length-mismatch'], ['control: random expectation 5', [3, [[0.616, -0.07], [-0.126, -0.492], [-0.385, 0.046], [-0.714, -0.852], [0.968, -0.035], [-0.129, -0.794], [-0.299, 0.172], [0.772, -0.916]], 'YYZ'], -0.229604], ['control: random expectation 6', [2, [[0.423, -0.627], [-0.829, 0.103], [0.962, -0.142], [-0.494, -0.183]], 'XX'], -0.7271], ['control: random expectation 7', [1, [[-1.206, 1.877], [0.69, -0.341]], 'I'], 1.0], ['control: random expectation 8', [1, [[0.52, 0.586], [-0.138, -0.781]], 'I'], 1.0]], [['regression: short Y on three qubits', [3, [[0.5, 0], [0, 0.5], [0, 0], [0.5, 0], [0, 0], [0, 0], [0, 0], [0.5, 0]], 'YZ'], 'length-mismatch'], ['regression: short Z on excited high qubit', [2, [[0, 0], [0, 0], [1, 0], [0, 0]], 'Z'], 'length-mismatch'], ['regression: short ZX', [3, [[0.6, 0], [0.8, 0], [0, 0], [0, 0], [0, 0], [0, 0], [0, 0], [0, 0]], 'ZX'], 'length-mismatch'], ['control: random expectation 9', [3, [[0.685, -0.091], [1.56, 1.459], [-1.17, 0.687], [-0.305, 1.609], [-0.876, -1.673], [-0.535, 0.008], [-1.818, 1.331], [1.693, 1.162]], 'IXI'], -0.046053], ['control: random expectation 10', [3, [[0.0, 0.0], [1.545, 0.342], [0.0, 0.0], [-1.862, -1.433], [0.0, 0.0], [-0.66, -1.507], [0.913, -1.017], [-1.982, -0.009]], 'IZX'], 0.21787], ['control: random expectation 11', [1, [[-0.422, -1.932], [-1.435, 1.833]], 'Z'], -0.161676], ['control: random expectation 12', [3, [[1.741, 0.945], [0.0, 0.0], [0.705, -0.271], [0.0, 0.0], [0.0, 0.0], [0.0, 0.0], [-1.277, -0.575], [-0.732, 0.787]], 'ZZX'], 0.12672]]]\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":"542181a3ef45ebdfd5dc3fa1c7732e28b870c7679691e7c2662b514b98ef735a","source":"\"\"\"Failure Map reference implementation. Python standard library only.\"\"\"\nimport json\nimport math\nN = 1\nobservations = []\ndef solve(x):\n    n, amps, pauli = x\n    if len(pauli) != n:\n        return 'length-mismatch'\n    if any(c not in 'IXYZ' for c in pauli):\n        return 'bad-pauli'\n    psi = [complex(a, b) for a, b in amps]\n    acc = 0j\n    for i, v in enumerate(psi):\n        j = i\n        phase = 1 + 0j\n        for k, c in enumerate(pauli):\n            q = n - 1 - k\n            bit = (i >> q) & 1\n            if c in 'XY':\n                j ^= 1 << q\n            if c == 'Z' and bit:\n                phase = -phase\n            elif c == 'Y':\n                phase *= 1j if bit == 0 else -1j\n        acc += psi[j].conjugate() * phase * v\n    norm = sum(abs(v) ** 2 for v in psi)\n    return round((acc / norm).real, 6) + 0.0\ndef check(label, actual, expected):\n    observations.append({\"check\": label, \"actual\": actual, \"expected\": expected, \"passed\": actual == expected})\nfixtures = [[['regression: short string', [2, [[1, 0], [0, 0], [0, 0], [0, 0]], 'Z'], 'length-mismatch'], ['regression: short X on bell', [2, [[0.707107, 0], [0, 0], [0, 0], [0.707107, 0]], 'X'], 'length-mismatch'], ['regression: short Y on three qubits', [3, [[0.5, 0], [0, 0.5], [0, 0], [0.5, 0], [0, 0], [0, 0], [0, 0], [0.5, 0]], 'YZ'], 'length-mismatch'], ['control: ZI on |01>', [2, [[0, 0], [1, 0], [0, 0], [0, 0]], 'ZI'], 1.0], ['control: IZ on |01>', [2, [[0, 0], [1, 0], [0, 0], [0, 0]], 'IZ'], -1.0], ['control: Y on |+i>', [1, [[0.707107, 0], [0, 0.707107]], 'Y'], 1.0], ['control: X on |+>', [1, [[0.707107, 0], [0.707107, 0]], 'X'], 1.0]], [['regression: short Z on excited high qubit', [2, [[0, 0], [0, 0], [1, 0], [0, 0]], 'Z'], 'length-mismatch'], ['regression: short ZX', [3, [[0.6, 0], [0.8, 0], [0, 0], [0, 0], [0, 0], [0, 0], [0, 0], [0, 0]], 'ZX'], 'length-mismatch'], ['regression: short Y on three qubits', [3, [[0.5, 0], [0, 0.5], [0, 0], [0.5, 0], [0, 0], [0, 0], [0, 0], [0.5, 0]], 'YZ'], 'length-mismatch'], ['control: long string', [1, [[1, 0], [0, 0]], 'ZZ'], 'length-mismatch'], ['control: lowercase pauli', [1, [[1, 0], [0, 0]], 'z'], 'bad-pauli'], ['control: unnormalized Z', [1, [[3, 0], [0, 4]], 'Z'], -0.28], ['control: random expectation 0', [1, [[0.071, 0.727], [-1.619, -1.464]], 'I'], 1.0]], [['regression: short X on bell', [2, [[0.707107, 0], [0, 0], [0, 0], [0.707107, 0]], 'X'], 'length-mismatch'], ['regression: short Y on three qubits', [3, [[0.5, 0], [0, 0.5], [0, 0], [0.5, 0], [0, 0], [0, 0], [0, 0], [0.5, 0]], 'YZ'], 'length-mismatch'], ['regression: short ZX', [3, [[0.6, 0], [0.8, 0], [0, 0], [0, 0], [0, 0], [0, 0], [0, 0], [0, 0]], 'ZX'], 'length-mismatch'], ['control: random expectation 1', [1, [[0.0, 0.0], [1.97, 0.65]], 'X'], 0.0], ['control: random expectation 2', [1, [[0.489, 0.112], [-0.446, 0.868]], 'X'], -0.200793], ['control: random expectation 3', [1, [[-0.119, -0.141], [0.0, 0.0]], 'Z'], 1.0], ['control: random expectation 4', [1, [[-0.408, 0.461], [-0.359, 0.326]], 'Y'], 0.105809]], [['regression: short ZX', [3, [[0.6, 0], [0.8, 0], [0, 0], [0, 0], [0, 0], [0, 0], [0, 0], [0, 0]], 'ZX'], 'length-mismatch'], ['regression: short string', [2, [[1, 0], [0, 0], [0, 0], [0, 0]], 'Z'], 'length-mismatch'], ['regression: short X on bell', [2, [[0.707107, 0], [0, 0], [0, 0], [0.707107, 0]], 'X'], 'length-mismatch'], ['control: random expectation 5', [3, [[0.616, -0.07], [-0.126, -0.492], [-0.385, 0.046], [-0.714, -0.852], [0.968, -0.035], [-0.129, -0.794], [-0.299, 0.172], [0.772, -0.916]], 'YYZ'], -0.229604], ['control: random expectation 6', [2, [[0.423, -0.627], [-0.829, 0.103], [0.962, -0.142], [-0.494, -0.183]], 'XX'], -0.7271], ['control: random expectation 7', [1, [[-1.206, 1.877], [0.69, -0.341]], 'I'], 1.0], ['control: random expectation 8', [1, [[0.52, 0.586], [-0.138, -0.781]], 'I'], 1.0]], [['regression: short Y on three qubits', [3, [[0.5, 0], [0, 0.5], [0, 0], [0.5, 0], [0, 0], [0, 0], [0, 0], [0.5, 0]], 'YZ'], 'length-mismatch'], ['regression: short Z on excited high qubit', [2, [[0, 0], [0, 0], [1, 0], [0, 0]], 'Z'], 'length-mismatch'], ['regression: short ZX', [3, [[0.6, 0], [0.8, 0], [0, 0], [0, 0], [0, 0], [0, 0], [0, 0], [0, 0]], 'ZX'], 'length-mismatch'], ['control: random expectation 9', [3, [[0.685, -0.091], [1.56, 1.459], [-1.17, 0.687], [-0.305, 1.609], [-0.876, -1.673], [-0.535, 0.008], [-1.818, 1.331], [1.693, 1.162]], 'IXI'], -0.046053], ['control: random expectation 10', [3, [[0.0, 0.0], [1.545, 0.342], [0.0, 0.0], [-1.862, -1.433], [0.0, 0.0], [-0.66, -1.507], [0.913, -1.017], [-1.982, -0.009]], 'IZX'], 0.21787], ['control: random expectation 11', [1, [[-0.422, -1.932], [-1.435, 1.833]], 'Z'], -0.161676], ['control: random expectation 12', [3, [[1.741, 0.945], [0.0, 0.0], [0.705, -0.271], [0.0, 0.0], [0.0, 0.0], [0.0, 0.0], [-1.277, -0.575], [-0.732, 0.787]], 'ZZX'], 0.12672]]]\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":"A deterministic bounded teaching model with a stipulated toy contract; amplitudes are rounded to fixed decimals for strict JSON output. It is not a production quantum SDK and claims no standards conformance. 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-quantum_circuit_simulation-pauli-expectation-string-length-validation","generated_at":"2026-09-29T14:51:31.547402+00:00","license":"CC0-1.0","python":"3.12.14","seed":1,"split":"open-access"},"relevance":"Pauli expectation values are the observable layer of variational algorithms; string-order or phase slips bias every energy estimate.","repair":"Require len(pauli) == n exactly.","root_cause":"The length guard only rejects strings longer than n.","sha256":"a98c29e62f70a231926d7f42f06ff1e1aff571bc1ce9b9e726af5877b5cf1fdc","title":"Pauli expectation accepts strings shorter than the register · case 01","variant":1,"variant_policy":"Five numbered records share a model and may reuse boundary fixtures.","verification":{"attempt":{"elapsed_ms":39.733,"exit_code":1,"observations":[{"actual":1.0,"check":"regression: short string","expected":"length-mismatch","passed":false},{"actual":0.0,"check":"regression: short X on bell","expected":"length-mismatch","passed":false},{"actual":0.0,"check":"regression: short Y on three qubits","expected":"length-mismatch","passed":false},{"actual":1.0,"check":"control: ZI on |01>","expected":1.0,"passed":true},{"actual":-1.0,"check":"control: IZ on |01>","expected":-1.0,"passed":true},{"actual":1.0,"check":"control: Y on |+i>","expected":1.0,"passed":true},{"actual":1.0,"check":"control: X on |+>","expected":1.0,"passed":true}],"passed":false,"stderr":"","stdout":"{\"observations\": [{\"check\": \"regression: short string\", \"actual\": 1.0, \"expected\": \"length-mismatch\", \"passed\": false}, {\"check\": \"regression: short X on bell\", \"actual\": 0.0, \"expected\": \"length-mismatch\", \"passed\": false}, {\"check\": 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