FA-78101 / Subtitle cue timing / Open access

Adjacent duplicate cue merging: merge short-circuit · case 01

Merged duplicates appear twice: once extended and once as the original repeat.

Verified by executionVariant 1 · 9 checks per implementationDownload source bundle ↓JSON ↗

ROOT CAUSE

After extending the previous cue the loop falls through and also appends the duplicate.

VERIFIED REPAIR

Skip the duplicate after folding it into the previous output cue.

Unsuccessful approach: Restarting the merged cue at the duplicate start hides the first occurrence of the line.

Case contract

Walk cues [start,end,text] in order. Text is normalized by collapsing whitespace runs to single spaces and trimming. A cue whose normalized text is nonempty and equal to the previous output cue text, starting at most max_gap after that cue ends (overlaps included), is merged: the output end becomes the later of the two ends. Output cues carry normalized text.

Why this case matters

Subtitle timing defects shift, hide or overlap captions that viewers depend on for comprehension and accessibility.

1 / The failure

Exit 1

"""Failure Map reference implementation. Python standard library only."""
import json

N = 1
observations = []
def solve(cues, max_gap):
    out=[]
    for s,e,t in cues:
        norm=' '.join(t.split())
        if out and norm and out[-1][2]==norm and s-out[-1][1]<=max_gap:
            out[-1][1]=max(out[-1][1],e)
            pass
        out.append([s,e,norm])
    return out
def check(label, actual, expected):
    observations.append({"check": label, "actual": actual, "expected": expected, "passed": actual == expected})
fixtures = [[('regression: merge short-circuit', [[[0, 500, 'Yes'], [540, 900, 'Yes']], 40], [[0, 900, 'Yes']]), ('regression variant: merge short-circuit', [[[0, 500, ' Yes'], [900, 1900, 'Yes '], [2300, 2800, 'Go now'], [3200, 3700, ' Yes'], [3799, 4799, 'Yes'], [4799, 4899, '  ']], 100], [[0, 500, 'Yes'], [900, 1900, 'Yes'], [2300, 2800, 'Go now'], [3200, 4799, 'Yes'], [4799, 4899, '']]), ('partial repair probe: merge short-circuit', [[[0, 100, 'Go\nnow'], [100, 1100, 'Yes'], [1200, 1700, 'Yes'], [1799, 1899, 'No'], [1599, 2099, 'Go\nnow']], 100], [[0, 100, 'Go now'], [100, 1700, 'Yes'], [1799, 1899, 'No'], [1599, 2099, 'Go now']]), ('partial repair variant: merge short-circuit', [[[500, 600, 'Yes sir'], [300, 400, 'Yes  sir'], [-300, 200, ' Yes']], 100], [[500, 600, 'Yes sir'], [-300, 200, 'Yes']]), ('boundary control', [[[0, 100, ' '], [100, 200, ' ']], 0], [[0, 100, ''], [100, 200, '']]), ('boundary control', [[[0, 100, 'A'], [150, 200, 'A']], 40], [[0, 100, 'A'], [150, 200, 'A']]), ('normal control', [[[500, 1000, 'No'], [1101, 1601, 'Yes  sir']], 100], [[500, 1000, 'No'], [1101, 1601, 'Yes sir']]), ('normal control', [[[500, 1000, ''], [1000, 1100, 'Go now']], 100], [[500, 1000, ''], [1000, 1100, 'Go now']]), ('normal control', [[[0, 1000, 'Yes  sir'], [1000, 1100, ''], [800, 900, 'Yes sir']], 100], [[0, 1000, 'Yes sir'], [1000, 1100, ''], [800, 900, 'Yes sir']])], [('regression: merge short-circuit', [[[0, 500, 'Yes'], [100, 300, 'Yes']], 0], [[0, 500, 'Yes']]), ('regression variant: merge short-circuit', [[[500, 1500, 'Yes sir'], [1539, 2539, 'Yes  sir']], 40], [[500, 2539, 'Yes sir']]), ('partial repair probe: merge short-circuit', [[[0, 500, 'Yes '], [600, 1600, ' Yes'], [1300, 1800, 'Yes '], [1900, 2400, 'Yes '], [2100, 2200, 'Yes  sir']], 100], [[0, 2400, 'Yes'], [2100, 2200, 'Yes sir']]), ('partial repair variant: merge short-circuit', [[[500, 1000, 'Yes sir'], [1000, 2000, 'Yes '], [2000, 2500, ' Yes'], [2900, 3000, 'Yes sir']], 0], [[500, 1000, 'Yes sir'], [1000, 2500, 'Yes'], [2900, 3000, 'Yes sir']]), ('boundary control', [[[0, 100, 'A'], [150, 200, 'A']], 40], [[0, 100, 'A'], [150, 200, 'A']]), ('boundary control', [[[0, 100, ' '], [100, 200, ' ']], 0], [[0, 100, ''], [100, 200, '']]), ('normal control', [[[500, 600, 'Yes  sir'], [699, 1199, 'Go\nnow'], [1299, 2299, 'Yes '], [1999, 2999, 'Yes  sir']], 100], [[500, 600, 'Yes sir'], [699, 1199, 'Go now'], [1299, 2299, 'Yes'], [1999, 2999, 'Yes sir']]), ('normal control', [[[500, 1000, 'No'], [1099, 1599, 'Go now'], [1700, 1800, '  '], [1899, 1999, '']], 100], [[500, 1000, 'No'], [1099, 1599, 'Go now'], [1700, 1800, ''], [1899, 1999, '']]), ('normal control', [[[0, 500, 'Yes  sir'], [-200, -100, '  '], [1, 101, 'Go\nnow'], [501, 601, 'Yes'], [700, 1700, 'Go now']], 100], [[0, 500, 'Yes sir'], [-200, -100, ''], [1, 101, 'Go now'], [501, 601, 'Yes'], [700, 1700, 'Go now']])], [('regression: merge short-circuit', [[[0, 100, 'Go\nnow'], [100, 1100, 'Yes'], [1200, 1700, 'Yes'], [1799, 1899, 'No'], [1599, 2099, 'Go\nnow']], 100], [[0, 100, 'Go now'], [100, 1700, 'Yes'], [1799, 1899, 'No'], [1599, 2099, 'Go now']]), ('regression variant: merge short-circuit', [[[500, 1500, 'Yes'], [1539, 2039, 'Yes ']], 40], [[500, 2039, 'Yes']]), ('partial repair probe: merge short-circuit', [[[500, 1000, '  '], [700, 1200, ' Yes'], [1200, 1300, 'Yes '], [1301, 1401, ''], [1401, 2401, 'No']], 0], [[500, 1000, ''], [700, 1300, 'Yes'], [1301, 1401, ''], [1401, 2401, 'No']]), ('partial repair variant: merge short-circuit', [[[500, 1000, ' Yes'], [1100, 1600, 'Yes  sir'], [1699, 2699, 'Yes  sir']], 100], [[500, 1000, 'Yes'], [1100, 2699, 'Yes sir']]), ('boundary control', [[[0, 100, ' '], [100, 200, ' ']], 0], [[0, 100, ''], [100, 200, '']]), ('boundary control', [[[0, 100, 'A'], [150, 200, 'A']], 40], [[0, 100, 'A'], [150, 200, 'A']]), ('normal control', [[[500, 600, '  '], [601, 1601, 'Yes '], [2001, 2101, 'Yes '], [2100, 2600, 'Go\nnow'], [2599, 2699, 'Yes '], [2699, 3699, 'Go now']], 0], [[500, 600, ''], [601, 1601, 'Yes'], [2001, 2101, 'Yes'], [2100, 2600, 'Go now'], [2599, 2699, 'Yes'], [2699, 3699, 'Go now']]), ('normal control', [[[0, 1000, ' Yes'], [1400, 1900, 'No']], 100], [[0, 1000, 'Yes'], [1400, 1900, 'No']]), ('normal control', [[[0, 1000, 'Yes'], [1041, 2041, ''], [2041, 2541, 'No']], 40], [[0, 1000, 'Yes'], [1041, 2041, ''], [2041, 2541, 'No']])], [('regression: merge short-circuit', [[[0, 500, 'Yes '], [600, 1600, ' Yes'], [1300, 1800, 'Yes '], [1900, 2400, 'Yes '], [2100, 2200, 'Yes  sir']], 100], [[0, 2400, 'Yes'], [2100, 2200, 'Yes sir']]), ('regression variant: merge short-circuit', [[[500, 1000, ' Yes'], [1041, 2041, 'No'], [1341, 1841, 'Yes '], [1881, 2881, ' Yes'], [2922, 3922, 'Yes ']], 40], [[500, 1000, 'Yes'], [1041, 2041, 'No'], [1341, 2881, 'Yes'], [2922, 3922, 'Yes']]), ('partial repair probe: merge short-circuit', [[[0, 500, ' Yes'], [900, 1900, 'Yes '], [2300, 2800, 'Go now'], [3200, 3700, ' Yes'], [3799, 4799, 'Yes'], [4799, 4899, '  ']], 100], [[0, 500, 'Yes'], [900, 1900, 'Yes'], [2300, 2800, 'Go now'], [3200, 4799, 'Yes'], [4799, 4899, '']]), ('partial repair variant: merge short-circuit', [[[500, 600, 'Yes'], [639, 739, 'Yes  sir'], [439, 1439, 'Yes'], [1439, 1539, 'Yes'], [1239, 2239, ''], [2278, 3278, 'Yes sir']], 40], [[500, 600, 'Yes'], [639, 739, 'Yes sir'], [439, 1539, 'Yes'], [1239, 2239, ''], [2278, 3278, 'Yes sir']]), ('boundary control', [[[0, 100, 'A'], [150, 200, 'A']], 40], [[0, 100, 'A'], [150, 200, 'A']]), ('boundary control', [[[0, 100, ' '], [100, 200, ' ']], 0], [[0, 100, ''], [100, 200, '']]), ('normal control', [[[0, 500, 'Go\nnow'], [200, 700, 'Yes sir'], [801, 1801, 'Go\nnow'], [1901, 2401, 'Yes  sir'], [1701, 1801, 'Yes ']], 100], [[0, 500, 'Go now'], [200, 700, 'Yes sir'], [801, 1801, 'Go now'], [1901, 2401, 'Yes sir'], [1701, 1801, 'Yes']]), ('normal control', [[[0, 100, ' Yes'], [100, 1100, 'Go now']], 0], [[0, 100, 'Yes'], [100, 1100, 'Go now']]), ('normal control', [[[0, 100, 'Yes sir']], 40], [[0, 100, 'Yes sir']])], [('regression: merge short-circuit', [[[500, 1000, '  '], [700, 1200, ' Yes'], [1200, 1300, 'Yes '], [1301, 1401, ''], [1401, 2401, 'No']], 0], [[500, 1000, ''], [700, 1300, 'Yes'], [1301, 1401, ''], [1401, 2401, 'No']]), ('regression variant: merge short-circuit', [[[500, 600, 'Yes sir'], [300, 400, 'Yes  sir'], [-300, 200, ' Yes']], 100], [[500, 600, 'Yes sir'], [-300, 200, 'Yes']]), ('partial repair probe: merge short-circuit', [[[500, 1500, 'Yes sir'], [1539, 2539, 'Yes  sir']], 40], [[500, 2539, 'Yes sir']]), ('partial repair variant: merge short-circuit', [[[500, 1500, 'Yes sir'], [800, 1800, 'Yes '], [1799, 2299, ' Yes'], [1599, 1699, ''], [2099, 3099, 'No'], [2799, 3299, '']], 0], [[500, 1500, 'Yes sir'], [800, 2299, 'Yes'], [1599, 1699, ''], [2099, 3099, 'No'], [2799, 3299, '']]), ('boundary control', [[[0, 100, ' '], [100, 200, ' ']], 0], [[0, 100, ''], [100, 200, '']]), ('boundary control', [[[0, 100, 'A'], [150, 200, 'A']], 40], [[0, 100, 'A'], [150, 200, 'A']]), ('normal control', [[[500, 1500, 'No']], 40], [[500, 1500, 'No']]), ('normal control', [[[0, 1000, 'Yes sir']], 0], [[0, 1000, 'Yes sir']]), ('normal control', [[[500, 1000, 'Go\nnow']], 0], [[500, 1000, 'Go now']])]]
for label, args, expected in fixtures[N-1]:
    check(label, solve(*args), expected)
print(json.dumps({"observations": observations, "passed": all(x["passed"] for x in observations)}, ensure_ascii=False))
raise SystemExit(0 if all(x["passed"] for x in observations) else 1)

Boundary fixture	Actual	Expected	Outcome
regression: merge short-circuit	`[[0, 900, 'Yes'], [540, 900, 'Yes']]`	`[[0, 900, 'Yes']]`	Failed
regression variant: merge short-circuit	`[[0, 500, 'Yes'], [900, 1900, 'Yes'], [2300, 2800, 'Go now'], [3200, 4799, 'Yes'], [3799, 4799, 'Yes'], [4799, 4899, '']]`	`[[0, 500, 'Yes'], [900, 1900, 'Yes'], [2300, 2800, 'Go now'], [3200, 4799, 'Yes'], [4799, 4899, '']]`	Failed
partial repair probe: merge short-circuit	`[[0, 100, 'Go now'], [100, 1700, 'Yes'], [1200, 1700, 'Yes'], [1799, 1899, 'No'], [1599, 2099, 'Go now']]`	`[[0, 100, 'Go now'], [100, 1700, 'Yes'], [1799, 1899, 'No'], [1599, 2099, 'Go now']]`	Failed
partial repair variant: merge short-circuit	`[[500, 600, 'Yes sir'], [300, 400, 'Yes sir'], [-300, 200, 'Yes']]`	`[[500, 600, 'Yes sir'], [-300, 200, 'Yes']]`	Failed
boundary control	`[[0, 100, ''], [100, 200, '']]`	`[[0, 100, ''], [100, 200, '']]`	Passed
boundary control	`[[0, 100, 'A'], [150, 200, 'A']]`	`[[0, 100, 'A'], [150, 200, 'A']]`	Passed
normal control	`[[500, 1000, 'No'], [1101, 1601, 'Yes sir']]`	`[[500, 1000, 'No'], [1101, 1601, 'Yes sir']]`	Passed
normal control	`[[500, 1000, ''], [1000, 1100, 'Go now']]`	`[[500, 1000, ''], [1000, 1100, 'Go now']]`	Passed
normal control	`[[0, 1000, 'Yes sir'], [1000, 1100, ''], [800, 900, 'Yes sir']]`	`[[0, 1000, 'Yes sir'], [1000, 1100, ''], [800, 900, 'Yes sir']]`	Passed

SHA-256 / f87d4cadab260a07df2d76c5aec358c186b443f236315dc82ea59e7818b5a583

2 / The unsuccessful fix

Exit 1

"""Failure Map reference implementation. Python standard library only."""
import json

N = 1
observations = []
def solve(cues, max_gap):
    out=[]
    for s,e,t in cues:
        norm=' '.join(t.split())
        if out and norm and out[-1][2]==norm and s-out[-1][1]<=max_gap:
            out[-1][1]=max(out[-1][1],e)
            out[-1][0]=s
            continue
        out.append([s,e,norm])
    return out
def check(label, actual, expected):
    observations.append({"check": label, "actual": actual, "expected": expected, "passed": actual == expected})
fixtures = [[('regression: merge short-circuit', [[[0, 500, 'Yes'], [540, 900, 'Yes']], 40], [[0, 900, 'Yes']]), ('regression variant: merge short-circuit', [[[0, 500, ' Yes'], [900, 1900, 'Yes '], [2300, 2800, 'Go now'], [3200, 3700, ' Yes'], [3799, 4799, 'Yes'], [4799, 4899, '  ']], 100], [[0, 500, 'Yes'], [900, 1900, 'Yes'], [2300, 2800, 'Go now'], [3200, 4799, 'Yes'], [4799, 4899, '']]), ('partial repair probe: merge short-circuit', [[[0, 100, 'Go\nnow'], [100, 1100, 'Yes'], [1200, 1700, 'Yes'], [1799, 1899, 'No'], [1599, 2099, 'Go\nnow']], 100], [[0, 100, 'Go now'], [100, 1700, 'Yes'], [1799, 1899, 'No'], [1599, 2099, 'Go now']]), ('partial repair variant: merge short-circuit', [[[500, 600, 'Yes sir'], [300, 400, 'Yes  sir'], [-300, 200, ' Yes']], 100], [[500, 600, 'Yes sir'], [-300, 200, 'Yes']]), ('boundary control', [[[0, 100, ' '], [100, 200, ' ']], 0], [[0, 100, ''], [100, 200, '']]), ('boundary control', [[[0, 100, 'A'], [150, 200, 'A']], 40], [[0, 100, 'A'], [150, 200, 'A']]), ('normal control', [[[500, 1000, 'No'], [1101, 1601, 'Yes  sir']], 100], [[500, 1000, 'No'], [1101, 1601, 'Yes sir']]), ('normal control', [[[500, 1000, ''], [1000, 1100, 'Go now']], 100], [[500, 1000, ''], [1000, 1100, 'Go now']]), ('normal control', [[[0, 1000, 'Yes  sir'], [1000, 1100, ''], [800, 900, 'Yes sir']], 100], [[0, 1000, 'Yes sir'], [1000, 1100, ''], [800, 900, 'Yes sir']])], [('regression: merge short-circuit', [[[0, 500, 'Yes'], [100, 300, 'Yes']], 0], [[0, 500, 'Yes']]), ('regression variant: merge short-circuit', [[[500, 1500, 'Yes sir'], [1539, 2539, 'Yes  sir']], 40], [[500, 2539, 'Yes sir']]), ('partial repair probe: merge short-circuit', [[[0, 500, 'Yes '], [600, 1600, ' Yes'], [1300, 1800, 'Yes '], [1900, 2400, 'Yes '], [2100, 2200, 'Yes  sir']], 100], [[0, 2400, 'Yes'], [2100, 2200, 'Yes sir']]), ('partial repair variant: merge short-circuit', [[[500, 1000, 'Yes sir'], [1000, 2000, 'Yes '], [2000, 2500, ' Yes'], [2900, 3000, 'Yes sir']], 0], [[500, 1000, 'Yes sir'], [1000, 2500, 'Yes'], [2900, 3000, 'Yes sir']]), ('boundary control', [[[0, 100, 'A'], [150, 200, 'A']], 40], [[0, 100, 'A'], [150, 200, 'A']]), ('boundary control', [[[0, 100, ' '], [100, 200, ' ']], 0], [[0, 100, ''], [100, 200, '']]), ('normal control', [[[500, 600, 'Yes  sir'], [699, 1199, 'Go\nnow'], [1299, 2299, 'Yes '], [1999, 2999, 'Yes  sir']], 100], [[500, 600, 'Yes sir'], [699, 1199, 'Go now'], [1299, 2299, 'Yes'], [1999, 2999, 'Yes sir']]), ('normal control', [[[500, 1000, 'No'], [1099, 1599, 'Go now'], [1700, 1800, '  '], [1899, 1999, '']], 100], [[500, 1000, 'No'], [1099, 1599, 'Go now'], [1700, 1800, ''], [1899, 1999, '']]), ('normal control', [[[0, 500, 'Yes  sir'], [-200, -100, '  '], [1, 101, 'Go\nnow'], [501, 601, 'Yes'], [700, 1700, 'Go now']], 100], [[0, 500, 'Yes sir'], [-200, -100, ''], [1, 101, 'Go now'], [501, 601, 'Yes'], [700, 1700, 'Go now']])], [('regression: merge short-circuit', [[[0, 100, 'Go\nnow'], [100, 1100, 'Yes'], [1200, 1700, 'Yes'], [1799, 1899, 'No'], [1599, 2099, 'Go\nnow']], 100], [[0, 100, 'Go now'], [100, 1700, 'Yes'], [1799, 1899, 'No'], [1599, 2099, 'Go now']]), ('regression variant: merge short-circuit', [[[500, 1500, 'Yes'], [1539, 2039, 'Yes ']], 40], [[500, 2039, 'Yes']]), ('partial repair probe: merge short-circuit', [[[500, 1000, '  '], [700, 1200, ' Yes'], [1200, 1300, 'Yes '], [1301, 1401, ''], [1401, 2401, 'No']], 0], [[500, 1000, ''], [700, 1300, 'Yes'], [1301, 1401, ''], [1401, 2401, 'No']]), ('partial repair variant: merge short-circuit', [[[500, 1000, ' Yes'], [1100, 1600, 'Yes  sir'], [1699, 2699, 'Yes  sir']], 100], [[500, 1000, 'Yes'], [1100, 2699, 'Yes sir']]), ('boundary control', [[[0, 100, ' '], [100, 200, ' ']], 0], [[0, 100, ''], [100, 200, '']]), ('boundary control', [[[0, 100, 'A'], [150, 200, 'A']], 40], [[0, 100, 'A'], [150, 200, 'A']]), ('normal control', [[[500, 600, '  '], [601, 1601, 'Yes '], [2001, 2101, 'Yes '], [2100, 2600, 'Go\nnow'], [2599, 2699, 'Yes '], [2699, 3699, 'Go now']], 0], [[500, 600, ''], [601, 1601, 'Yes'], [2001, 2101, 'Yes'], [2100, 2600, 'Go now'], [2599, 2699, 'Yes'], [2699, 3699, 'Go now']]), ('normal control', [[[0, 1000, ' Yes'], [1400, 1900, 'No']], 100], [[0, 1000, 'Yes'], [1400, 1900, 'No']]), ('normal control', [[[0, 1000, 'Yes'], [1041, 2041, ''], [2041, 2541, 'No']], 40], [[0, 1000, 'Yes'], [1041, 2041, ''], [2041, 2541, 'No']])], [('regression: merge short-circuit', [[[0, 500, 'Yes '], [600, 1600, ' Yes'], [1300, 1800, 'Yes '], [1900, 2400, 'Yes '], [2100, 2200, 'Yes  sir']], 100], [[0, 2400, 'Yes'], [2100, 2200, 'Yes sir']]), ('regression variant: merge short-circuit', [[[500, 1000, ' Yes'], [1041, 2041, 'No'], [1341, 1841, 'Yes '], [1881, 2881, ' Yes'], [2922, 3922, 'Yes ']], 40], [[500, 1000, 'Yes'], [1041, 2041, 'No'], [1341, 2881, 'Yes'], [2922, 3922, 'Yes']]), ('partial repair probe: merge short-circuit', [[[0, 500, ' Yes'], [900, 1900, 'Yes '], [2300, 2800, 'Go now'], [3200, 3700, ' Yes'], [3799, 4799, 'Yes'], [4799, 4899, '  ']], 100], [[0, 500, 'Yes'], [900, 1900, 'Yes'], [2300, 2800, 'Go now'], [3200, 4799, 'Yes'], [4799, 4899, '']]), ('partial repair variant: merge short-circuit', [[[500, 600, 'Yes'], [639, 739, 'Yes  sir'], [439, 1439, 'Yes'], [1439, 1539, 'Yes'], [1239, 2239, ''], [2278, 3278, 'Yes sir']], 40], [[500, 600, 'Yes'], [639, 739, 'Yes sir'], [439, 1539, 'Yes'], [1239, 2239, ''], [2278, 3278, 'Yes sir']]), ('boundary control', [[[0, 100, 'A'], [150, 200, 'A']], 40], [[0, 100, 'A'], [150, 200, 'A']]), ('boundary control', [[[0, 100, ' '], [100, 200, ' ']], 0], [[0, 100, ''], [100, 200, '']]), ('normal control', [[[0, 500, 'Go\nnow'], [200, 700, 'Yes sir'], [801, 1801, 'Go\nnow'], [1901, 2401, 'Yes  sir'], [1701, 1801, 'Yes ']], 100], [[0, 500, 'Go now'], [200, 700, 'Yes sir'], [801, 1801, 'Go now'], [1901, 2401, 'Yes sir'], [1701, 1801, 'Yes']]), ('normal control', [[[0, 100, ' Yes'], [100, 1100, 'Go now']], 0], [[0, 100, 'Yes'], [100, 1100, 'Go now']]), ('normal control', [[[0, 100, 'Yes sir']], 40], [[0, 100, 'Yes sir']])], [('regression: merge short-circuit', [[[500, 1000, '  '], [700, 1200, ' Yes'], [1200, 1300, 'Yes '], [1301, 1401, ''], [1401, 2401, 'No']], 0], [[500, 1000, ''], [700, 1300, 'Yes'], [1301, 1401, ''], [1401, 2401, 'No']]), ('regression variant: merge short-circuit', [[[500, 600, 'Yes sir'], [300, 400, 'Yes  sir'], [-300, 200, ' Yes']], 100], [[500, 600, 'Yes sir'], [-300, 200, 'Yes']]), ('partial repair probe: merge short-circuit', [[[500, 1500, 'Yes sir'], [1539, 2539, 'Yes  sir']], 40], [[500, 2539, 'Yes sir']]), ('partial repair variant: merge short-circuit', [[[500, 1500, 'Yes sir'], [800, 1800, 'Yes '], [1799, 2299, ' Yes'], [1599, 1699, ''], [2099, 3099, 'No'], [2799, 3299, '']], 0], [[500, 1500, 'Yes sir'], [800, 2299, 'Yes'], [1599, 1699, ''], [2099, 3099, 'No'], [2799, 3299, '']]), ('boundary control', [[[0, 100, ' '], [100, 200, ' ']], 0], [[0, 100, ''], [100, 200, '']]), ('boundary control', [[[0, 100, 'A'], [150, 200, 'A']], 40], [[0, 100, 'A'], [150, 200, 'A']]), ('normal control', [[[500, 1500, 'No']], 40], [[500, 1500, 'No']]), ('normal control', [[[0, 1000, 'Yes sir']], 0], [[0, 1000, 'Yes sir']]), ('normal control', [[[500, 1000, 'Go\nnow']], 0], [[500, 1000, 'Go now']])]]
for label, args, expected in fixtures[N-1]:
    check(label, solve(*args), expected)
print(json.dumps({"observations": observations, "passed": all(x["passed"] for x in observations)}, ensure_ascii=False))
raise SystemExit(0 if all(x["passed"] for x in observations) else 1)

Boundary fixture	Actual	Expected	Outcome
regression: merge short-circuit	`[[540, 900, 'Yes']]`	`[[0, 900, 'Yes']]`	Failed
regression variant: merge short-circuit	`[[0, 500, 'Yes'], [900, 1900, 'Yes'], [2300, 2800, 'Go now'], [3799, 4799, 'Yes'], [4799, 4899, '']]`	`[[0, 500, 'Yes'], [900, 1900, 'Yes'], [2300, 2800, 'Go now'], [3200, 4799, 'Yes'], [4799, 4899, '']]`	Failed
partial repair probe: merge short-circuit	`[[0, 100, 'Go now'], [1200, 1700, 'Yes'], [1799, 1899, 'No'], [1599, 2099, 'Go now']]`	`[[0, 100, 'Go now'], [100, 1700, 'Yes'], [1799, 1899, 'No'], [1599, 2099, 'Go now']]`	Failed
partial repair variant: merge short-circuit	`[[300, 600, 'Yes sir'], [-300, 200, 'Yes']]`	`[[500, 600, 'Yes sir'], [-300, 200, 'Yes']]`	Failed
boundary control	`[[0, 100, ''], [100, 200, '']]`	`[[0, 100, ''], [100, 200, '']]`	Passed
boundary control	`[[0, 100, 'A'], [150, 200, 'A']]`	`[[0, 100, 'A'], [150, 200, 'A']]`	Passed
normal control	`[[500, 1000, 'No'], [1101, 1601, 'Yes sir']]`	`[[500, 1000, 'No'], [1101, 1601, 'Yes sir']]`	Passed
normal control	`[[500, 1000, ''], [1000, 1100, 'Go now']]`	`[[500, 1000, ''], [1000, 1100, 'Go now']]`	Passed
normal control	`[[0, 1000, 'Yes sir'], [1000, 1100, ''], [800, 900, 'Yes sir']]`	`[[0, 1000, 'Yes sir'], [1000, 1100, ''], [800, 900, 'Yes sir']]`	Passed

SHA-256 / 6fdffa8b325ad252816b008857bc70dfcd3bb640ffe4882d8472961b09685394

3 / The verified repair

Exit 0

"""Failure Map reference implementation. Python standard library only."""
import json

N = 1
observations = []
def solve(cues, max_gap):
    out=[]
    for s,e,t in cues:
        norm=' '.join(t.split())
        if out and norm and out[-1][2]==norm and s-out[-1][1]<=max_gap:
            out[-1][1]=max(out[-1][1],e)
            continue
        out.append([s,e,norm])
    return out
def check(label, actual, expected):
    observations.append({"check": label, "actual": actual, "expected": expected, "passed": actual == expected})
fixtures = [[('regression: merge short-circuit', [[[0, 500, 'Yes'], [540, 900, 'Yes']], 40], [[0, 900, 'Yes']]), ('regression variant: merge short-circuit', [[[0, 500, ' Yes'], [900, 1900, 'Yes '], [2300, 2800, 'Go now'], [3200, 3700, ' Yes'], [3799, 4799, 'Yes'], [4799, 4899, '  ']], 100], [[0, 500, 'Yes'], [900, 1900, 'Yes'], [2300, 2800, 'Go now'], [3200, 4799, 'Yes'], [4799, 4899, '']]), ('partial repair probe: merge short-circuit', [[[0, 100, 'Go\nnow'], [100, 1100, 'Yes'], [1200, 1700, 'Yes'], [1799, 1899, 'No'], [1599, 2099, 'Go\nnow']], 100], [[0, 100, 'Go now'], [100, 1700, 'Yes'], [1799, 1899, 'No'], [1599, 2099, 'Go now']]), ('partial repair variant: merge short-circuit', [[[500, 600, 'Yes sir'], [300, 400, 'Yes  sir'], [-300, 200, ' Yes']], 100], [[500, 600, 'Yes sir'], [-300, 200, 'Yes']]), ('boundary control', [[[0, 100, ' '], [100, 200, ' ']], 0], [[0, 100, ''], [100, 200, '']]), ('boundary control', [[[0, 100, 'A'], [150, 200, 'A']], 40], [[0, 100, 'A'], [150, 200, 'A']]), ('normal control', [[[500, 1000, 'No'], [1101, 1601, 'Yes  sir']], 100], [[500, 1000, 'No'], [1101, 1601, 'Yes sir']]), ('normal control', [[[500, 1000, ''], [1000, 1100, 'Go now']], 100], [[500, 1000, ''], [1000, 1100, 'Go now']]), ('normal control', [[[0, 1000, 'Yes  sir'], [1000, 1100, ''], [800, 900, 'Yes sir']], 100], [[0, 1000, 'Yes sir'], [1000, 1100, ''], [800, 900, 'Yes sir']])], [('regression: merge short-circuit', [[[0, 500, 'Yes'], [100, 300, 'Yes']], 0], [[0, 500, 'Yes']]), ('regression variant: merge short-circuit', [[[500, 1500, 'Yes sir'], [1539, 2539, 'Yes  sir']], 40], [[500, 2539, 'Yes sir']]), ('partial repair probe: merge short-circuit', [[[0, 500, 'Yes '], [600, 1600, ' Yes'], [1300, 1800, 'Yes '], [1900, 2400, 'Yes '], [2100, 2200, 'Yes  sir']], 100], [[0, 2400, 'Yes'], [2100, 2200, 'Yes sir']]), ('partial repair variant: merge short-circuit', [[[500, 1000, 'Yes sir'], [1000, 2000, 'Yes '], [2000, 2500, ' Yes'], [2900, 3000, 'Yes sir']], 0], [[500, 1000, 'Yes sir'], [1000, 2500, 'Yes'], [2900, 3000, 'Yes sir']]), ('boundary control', [[[0, 100, 'A'], [150, 200, 'A']], 40], [[0, 100, 'A'], [150, 200, 'A']]), ('boundary control', [[[0, 100, ' '], [100, 200, ' ']], 0], [[0, 100, ''], [100, 200, '']]), ('normal control', [[[500, 600, 'Yes  sir'], [699, 1199, 'Go\nnow'], [1299, 2299, 'Yes '], [1999, 2999, 'Yes  sir']], 100], [[500, 600, 'Yes sir'], [699, 1199, 'Go now'], [1299, 2299, 'Yes'], [1999, 2999, 'Yes sir']]), ('normal control', [[[500, 1000, 'No'], [1099, 1599, 'Go now'], [1700, 1800, '  '], [1899, 1999, '']], 100], [[500, 1000, 'No'], [1099, 1599, 'Go now'], [1700, 1800, ''], [1899, 1999, '']]), ('normal control', [[[0, 500, 'Yes  sir'], [-200, -100, '  '], [1, 101, 'Go\nnow'], [501, 601, 'Yes'], [700, 1700, 'Go now']], 100], [[0, 500, 'Yes sir'], [-200, -100, ''], [1, 101, 'Go now'], [501, 601, 'Yes'], [700, 1700, 'Go now']])], [('regression: merge short-circuit', [[[0, 100, 'Go\nnow'], [100, 1100, 'Yes'], [1200, 1700, 'Yes'], [1799, 1899, 'No'], [1599, 2099, 'Go\nnow']], 100], [[0, 100, 'Go now'], [100, 1700, 'Yes'], [1799, 1899, 'No'], [1599, 2099, 'Go now']]), ('regression variant: merge short-circuit', [[[500, 1500, 'Yes'], [1539, 2039, 'Yes ']], 40], [[500, 2039, 'Yes']]), ('partial repair probe: merge short-circuit', [[[500, 1000, '  '], [700, 1200, ' Yes'], [1200, 1300, 'Yes '], [1301, 1401, ''], [1401, 2401, 'No']], 0], [[500, 1000, ''], [700, 1300, 'Yes'], [1301, 1401, ''], [1401, 2401, 'No']]), ('partial repair variant: merge short-circuit', [[[500, 1000, ' Yes'], [1100, 1600, 'Yes  sir'], [1699, 2699, 'Yes  sir']], 100], [[500, 1000, 'Yes'], [1100, 2699, 'Yes sir']]), ('boundary control', [[[0, 100, ' '], [100, 200, ' ']], 0], [[0, 100, ''], [100, 200, '']]), ('boundary control', [[[0, 100, 'A'], [150, 200, 'A']], 40], [[0, 100, 'A'], [150, 200, 'A']]), ('normal control', [[[500, 600, '  '], [601, 1601, 'Yes '], [2001, 2101, 'Yes '], [2100, 2600, 'Go\nnow'], [2599, 2699, 'Yes '], [2699, 3699, 'Go now']], 0], [[500, 600, ''], [601, 1601, 'Yes'], [2001, 2101, 'Yes'], [2100, 2600, 'Go now'], [2599, 2699, 'Yes'], [2699, 3699, 'Go now']]), ('normal control', [[[0, 1000, ' Yes'], [1400, 1900, 'No']], 100], [[0, 1000, 'Yes'], [1400, 1900, 'No']]), ('normal control', [[[0, 1000, 'Yes'], [1041, 2041, ''], [2041, 2541, 'No']], 40], [[0, 1000, 'Yes'], [1041, 2041, ''], [2041, 2541, 'No']])], [('regression: merge short-circuit', [[[0, 500, 'Yes '], [600, 1600, ' Yes'], [1300, 1800, 'Yes '], [1900, 2400, 'Yes '], [2100, 2200, 'Yes  sir']], 100], [[0, 2400, 'Yes'], [2100, 2200, 'Yes sir']]), ('regression variant: merge short-circuit', [[[500, 1000, ' Yes'], [1041, 2041, 'No'], [1341, 1841, 'Yes '], [1881, 2881, ' Yes'], [2922, 3922, 'Yes ']], 40], [[500, 1000, 'Yes'], [1041, 2041, 'No'], [1341, 2881, 'Yes'], [2922, 3922, 'Yes']]), ('partial repair probe: merge short-circuit', [[[0, 500, ' Yes'], [900, 1900, 'Yes '], [2300, 2800, 'Go now'], [3200, 3700, ' Yes'], [3799, 4799, 'Yes'], [4799, 4899, '  ']], 100], [[0, 500, 'Yes'], [900, 1900, 'Yes'], [2300, 2800, 'Go now'], [3200, 4799, 'Yes'], [4799, 4899, '']]), ('partial repair variant: merge short-circuit', [[[500, 600, 'Yes'], [639, 739, 'Yes  sir'], [439, 1439, 'Yes'], [1439, 1539, 'Yes'], [1239, 2239, ''], [2278, 3278, 'Yes sir']], 40], [[500, 600, 'Yes'], [639, 739, 'Yes sir'], [439, 1539, 'Yes'], [1239, 2239, ''], [2278, 3278, 'Yes sir']]), ('boundary control', [[[0, 100, 'A'], [150, 200, 'A']], 40], [[0, 100, 'A'], [150, 200, 'A']]), ('boundary control', [[[0, 100, ' '], [100, 200, ' ']], 0], [[0, 100, ''], [100, 200, '']]), ('normal control', [[[0, 500, 'Go\nnow'], [200, 700, 'Yes sir'], [801, 1801, 'Go\nnow'], [1901, 2401, 'Yes  sir'], [1701, 1801, 'Yes ']], 100], [[0, 500, 'Go now'], [200, 700, 'Yes sir'], [801, 1801, 'Go now'], [1901, 2401, 'Yes sir'], [1701, 1801, 'Yes']]), ('normal control', [[[0, 100, ' Yes'], [100, 1100, 'Go now']], 0], [[0, 100, 'Yes'], [100, 1100, 'Go now']]), ('normal control', [[[0, 100, 'Yes sir']], 40], [[0, 100, 'Yes sir']])], [('regression: merge short-circuit', [[[500, 1000, '  '], [700, 1200, ' Yes'], [1200, 1300, 'Yes '], [1301, 1401, ''], [1401, 2401, 'No']], 0], [[500, 1000, ''], [700, 1300, 'Yes'], [1301, 1401, ''], [1401, 2401, 'No']]), ('regression variant: merge short-circuit', [[[500, 600, 'Yes sir'], [300, 400, 'Yes  sir'], [-300, 200, ' Yes']], 100], [[500, 600, 'Yes sir'], [-300, 200, 'Yes']]), ('partial repair probe: merge short-circuit', [[[500, 1500, 'Yes sir'], [1539, 2539, 'Yes  sir']], 40], [[500, 2539, 'Yes sir']]), ('partial repair variant: merge short-circuit', [[[500, 1500, 'Yes sir'], [800, 1800, 'Yes '], [1799, 2299, ' Yes'], [1599, 1699, ''], [2099, 3099, 'No'], [2799, 3299, '']], 0], [[500, 1500, 'Yes sir'], [800, 2299, 'Yes'], [1599, 1699, ''], [2099, 3099, 'No'], [2799, 3299, '']]), ('boundary control', [[[0, 100, ' '], [100, 200, ' ']], 0], [[0, 100, ''], [100, 200, '']]), ('boundary control', [[[0, 100, 'A'], [150, 200, 'A']], 40], [[0, 100, 'A'], [150, 200, 'A']]), ('normal control', [[[500, 1500, 'No']], 40], [[500, 1500, 'No']]), ('normal control', [[[0, 1000, 'Yes sir']], 0], [[0, 1000, 'Yes sir']]), ('normal control', [[[500, 1000, 'Go\nnow']], 0], [[500, 1000, 'Go now']])]]
for label, args, expected in fixtures[N-1]:
    check(label, solve(*args), expected)
print(json.dumps({"observations": observations, "passed": all(x["passed"] for x in observations)}, ensure_ascii=False))
raise SystemExit(0 if all(x["passed"] for x in observations) else 1)

Boundary fixture	Actual	Expected	Outcome
regression: merge short-circuit	`[[0, 900, 'Yes']]`	`[[0, 900, 'Yes']]`	Passed
regression variant: merge short-circuit	`[[0, 500, 'Yes'], [900, 1900, 'Yes'], [2300, 2800, 'Go now'], [3200, 4799, 'Yes'], [4799, 4899, '']]`	`[[0, 500, 'Yes'], [900, 1900, 'Yes'], [2300, 2800, 'Go now'], [3200, 4799, 'Yes'], [4799, 4899, '']]`	Passed
partial repair probe: merge short-circuit	`[[0, 100, 'Go now'], [100, 1700, 'Yes'], [1799, 1899, 'No'], [1599, 2099, 'Go now']]`	`[[0, 100, 'Go now'], [100, 1700, 'Yes'], [1799, 1899, 'No'], [1599, 2099, 'Go now']]`	Passed
partial repair variant: merge short-circuit	`[[500, 600, 'Yes sir'], [-300, 200, 'Yes']]`	`[[500, 600, 'Yes sir'], [-300, 200, 'Yes']]`	Passed
boundary control	`[[0, 100, ''], [100, 200, '']]`	`[[0, 100, ''], [100, 200, '']]`	Passed
boundary control	`[[0, 100, 'A'], [150, 200, 'A']]`	`[[0, 100, 'A'], [150, 200, 'A']]`	Passed
normal control	`[[500, 1000, 'No'], [1101, 1601, 'Yes sir']]`	`[[500, 1000, 'No'], [1101, 1601, 'Yes sir']]`	Passed
normal control	`[[500, 1000, ''], [1000, 1100, 'Go now']]`	`[[500, 1000, ''], [1000, 1100, 'Go now']]`	Passed
normal control	`[[0, 1000, 'Yes sir'], [1000, 1100, ''], [800, 900, 'Yes sir']]`	`[[0, 1000, 'Yes sir'], [1000, 1100, ''], [800, 900, 'Yes sir']]`	Passed

SHA-256 / 870a1e3682b1f2fff8ce27c503ec68db71f34583b69cc9678cd1c207b0e24472

Verification & scope

A deterministic bounded teaching model with a stipulated toy contract; it does not claim conformance to any subtitle standard. 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.

Observations recorded using Python 3.12.14 at 2026-09-29T14:49:32.055936+00:00.

Case digest / a73c9f6e1d41b1273e3164c4bead78d700b971d1e8d85fa8f824b29318556f9a