FA-50591 / Raster clipping / Open access

Stencil clip pass: coverage gate · case 01

Stencil operations run on every sample whenever incoming coverage is nonempty.

Verified by executionVariant 1 · 16 checks per implementationDownload source bundle ↓JSON ↗

ROOT CAUSE

Stencil operations run on every sample whenever incoming coverage is nonempty.

VERIFIED REPAIR

Apply the documented state transition at coverage gate. Finite integer stencil values use three low bits. A clip pass compares masked stored values to masked reference, then applies distinct pass/fail operations only inside the incoming coverage set. Write masking preserves unrelated bits. Supported operations keep, zero, replace, saturating increment/decrement and invert.

Unsuccessful approach: A bounding interval around incoming samples fills holes in their actual coverage.

Case contract

Finite integer stencil values use three low bits. A clip pass compares masked stored values to masked reference, then applies distinct pass/fail operations only inside the incoming coverage set. Write masking preserves unrelated bits. Supported operations keep, zero, replace, saturating increment/decrement and invert.

Why this case matters

Raster clip state can leak coverage across draws even when every individual region is valid.

1 / The failure

Exit 1

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

N = 1
observations = []
def solve(commands, size):
    values=[0]*size
    out=[]
    for cmd in commands:
        if cmd[0]=='seed': values=[cmd[1][i%len(cmd[1])] & 7 for i in range(size)]; continue
        mask,reference,readmask,writemask,comparison,onpass,onfail=cmd
        for i in range(size):
            if not mask: continue
            old=values[i]
            left=old & readmask
            right=reference & readmask
            passed=(left==right if comparison=='equal' else left<right if comparison=='less' else left!=right)
            op=onpass if passed else onfail
            if op=='keep': new=old
            elif op=='zero': new=0
            elif op=='replace': new=reference
            elif op=='inc': new=min(7,old+1)
            elif op=='dec': new=max(0,old-1)
            else: new=old^7
            values[i]=((old & (~writemask & 7)) | (new & writemask)) & 7
        out.append(list(values))
    return out
def check(label, actual, expected):
    observations.append({"check": label, "actual": actual, "expected": expected, "passed": actual == expected})
if N == 1:
    check('explicit sequence 0', solve([['seed', [1, 2, 7, 0]], [[0], 1, 7, 7, 'equal', 'keep', 'zero']], 4), [[1, 2, 7, 0]])
    check('explicit sequence 1', solve([['seed', [5]], [[0, 1], 1, 3, 7, 'equal', 'zero', 'keep']], 4), [[0, 0, 5, 5]])
    check('explicit sequence 2', solve([['seed', [1]], [[0, 1], 2, 7, 7, 'less', 'replace', 'zero']], 4), [[2, 2, 1, 1]])
    check('explicit sequence 3', solve([['seed', [0]], [[0, 1], 4, 0, 7, 'equal', 'replace', 'keep']], 4), [[4, 4, 0, 0]])
    check('explicit sequence 4', solve([['seed', [7]], [[0, 1], 0, 7, 7, 'equal', 'keep', 'inc']], 4), [[7, 7, 7, 7]])
    check('explicit sequence 5', solve([['seed', [0]], [[0, 1], 0, 7, 7, 'equal', 'dec', 'keep']], 4), [[0, 0, 0, 0]])
    check('explicit sequence 6', solve([['seed', [3]], [[0, 1], 3, 7, 7, 'equal', 'invert', 'keep']], 4), [[4, 4, 3, 3]])
    check('explicit sequence 7', solve([['seed', [6]], [[0, 1], 1, 7, 1, 'not', 'replace', 'zero']], 4), [[7, 7, 6, 6]])
    check('explicit sequence 8', solve([['seed', [0]], [[], 0, 7, 7, 'equal', 'inc', 'keep']], 4), [[0, 0, 0, 0]])
    check('explicit sequence 9', solve([['seed', [1]], [[0], 2, 7, 7, 'equal', 'zero', 'replace']], 4), [[2, 1, 1, 1]])
    check('explicit sequence 10', solve([['seed', [1]], [[0, 2], 1, 7, 7, 'equal', 'zero', 'keep']], 4), [[0, 1, 0, 1]])
    check('explicit sequence 11', solve([['seed', [2]], [[0], 2, 7, 7, 'less', 'zero', 'keep']], 4), [[2, 2, 2, 2]])
    check('explicit sequence 12', solve([['seed', [5]], [[0], 1, 3, 7, 'equal', 'keep', 'zero']], 4), [[5, 5, 5, 5]])
    check('explicit sequence 13', solve([['seed', [5]], [[0], 1, 3, 7, 'equal', 'inc', 'zero']], 4), [[6, 5, 5, 5]])
    check('explicit sequence 14', solve([['seed', [5]], [[0], 1, 3, 7, 'equal', 'dec', 'zero']], 4), [[4, 5, 5, 5]])
    check('explicit sequence 15', solve([['seed', [5]], [[0], 1, 3, 7, 'equal', 'invert', 'zero']], 4), [[2, 5, 5, 5]])
if N == 2:
    check('explicit sequence 0', solve([['seed', [1, 2, 7, 0]], [[0], 1, 7, 7, 'equal', 'keep', 'zero']], 5), [[1, 2, 7, 0, 1]])
    check('explicit sequence 1', solve([['seed', [5]], [[0, 1], 1, 3, 7, 'equal', 'zero', 'keep']], 5), [[0, 0, 5, 5, 5]])
    check('explicit sequence 2', solve([['seed', [1]], [[0, 1], 2, 7, 7, 'less', 'replace', 'zero']], 5), [[2, 2, 1, 1, 1]])
    check('explicit sequence 3', solve([['seed', [0]], [[0, 1], 4, 0, 7, 'equal', 'replace', 'keep']], 5), [[4, 4, 0, 0, 0]])
    check('explicit sequence 4', solve([['seed', [7]], [[0, 1], 0, 7, 7, 'equal', 'keep', 'inc']], 5), [[7, 7, 7, 7, 7]])
    check('explicit sequence 5', solve([['seed', [0]], [[0, 1], 0, 7, 7, 'equal', 'dec', 'keep']], 5), [[0, 0, 0, 0, 0]])
    check('explicit sequence 6', solve([['seed', [3]], [[0, 1], 3, 7, 7, 'equal', 'invert', 'keep']], 5), [[4, 4, 3, 3, 3]])
    check('explicit sequence 7', solve([['seed', [6]], [[0, 1], 1, 7, 1, 'not', 'replace', 'zero']], 5), [[7, 7, 6, 6, 6]])
    check('explicit sequence 8', solve([['seed', [0]], [[], 0, 7, 7, 'equal', 'inc', 'keep']], 5), [[0, 0, 0, 0, 0]])
    check('explicit sequence 9', solve([['seed', [1]], [[0], 2, 7, 7, 'equal', 'zero', 'replace']], 5), [[2, 1, 1, 1, 1]])
    check('explicit sequence 10', solve([['seed', [1]], [[0, 2], 1, 7, 7, 'equal', 'zero', 'keep']], 5), [[0, 1, 0, 1, 1]])
    check('explicit sequence 11', solve([['seed', [2]], [[0], 2, 7, 7, 'less', 'zero', 'keep']], 5), [[2, 2, 2, 2, 2]])
    check('explicit sequence 12', solve([['seed', [5]], [[0], 1, 3, 7, 'equal', 'keep', 'zero']], 5), [[5, 5, 5, 5, 5]])
    check('explicit sequence 13', solve([['seed', [5]], [[0], 1, 3, 7, 'equal', 'inc', 'zero']], 5), [[6, 5, 5, 5, 5]])
    check('explicit sequence 14', solve([['seed', [5]], [[0], 1, 3, 7, 'equal', 'dec', 'zero']], 5), [[4, 5, 5, 5, 5]])
    check('explicit sequence 15', solve([['seed', [5]], [[0], 1, 3, 7, 'equal', 'invert', 'zero']], 5), [[2, 5, 5, 5, 5]])
if N == 3:
    check('explicit sequence 0', solve([['seed', [1, 2, 7, 0]], [[0], 1, 7, 7, 'equal', 'keep', 'zero']], 6), [[1, 2, 7, 0, 1, 2]])
    check('explicit sequence 1', solve([['seed', [5]], [[0, 1], 1, 3, 7, 'equal', 'zero', 'keep']], 6), [[0, 0, 5, 5, 5, 5]])
    check('explicit sequence 2', solve([['seed', [1]], [[0, 1], 2, 7, 7, 'less', 'replace', 'zero']], 6), [[2, 2, 1, 1, 1, 1]])
    check('explicit sequence 3', solve([['seed', [0]], [[0, 1], 4, 0, 7, 'equal', 'replace', 'keep']], 6), [[4, 4, 0, 0, 0, 0]])
    check('explicit sequence 4', solve([['seed', [7]], [[0, 1], 0, 7, 7, 'equal', 'keep', 'inc']], 6), [[7, 7, 7, 7, 7, 7]])
    check('explicit sequence 5', solve([['seed', [0]], [[0, 1], 0, 7, 7, 'equal', 'dec', 'keep']], 6), [[0, 0, 0, 0, 0, 0]])
    check('explicit sequence 6', solve([['seed', [3]], [[0, 1], 3, 7, 7, 'equal', 'invert', 'keep']], 6), [[4, 4, 3, 3, 3, 3]])
    check('explicit sequence 7', solve([['seed', [6]], [[0, 1], 1, 7, 1, 'not', 'replace', 'zero']], 6), [[7, 7, 6, 6, 6, 6]])
    check('explicit sequence 8', solve([['seed', [0]], [[], 0, 7, 7, 'equal', 'inc', 'keep']], 6), [[0, 0, 0, 0, 0, 0]])
    check('explicit sequence 9', solve([['seed', [1]], [[0], 2, 7, 7, 'equal', 'zero', 'replace']], 6), [[2, 1, 1, 1, 1, 1]])
    check('explicit sequence 10', solve([['seed', [1]], [[0, 2], 1, 7, 7, 'equal', 'zero', 'keep']], 6), [[0, 1, 0, 1, 1, 1]])
    check('explicit sequence 11', solve([['seed', [2]], [[0], 2, 7, 7, 'less', 'zero', 'keep']], 6), [[2, 2, 2, 2, 2, 2]])
    check('explicit sequence 12', solve([['seed', [5]], [[0], 1, 3, 7, 'equal', 'keep', 'zero']], 6), [[5, 5, 5, 5, 5, 5]])
    check('explicit sequence 13', solve([['seed', [5]], [[0], 1, 3, 7, 'equal', 'inc', 'zero']], 6), [[6, 5, 5, 5, 5, 5]])
    check('explicit sequence 14', solve([['seed', [5]], [[0], 1, 3, 7, 'equal', 'dec', 'zero']], 6), [[4, 5, 5, 5, 5, 5]])
    check('explicit sequence 15', solve([['seed', [5]], [[0], 1, 3, 7, 'equal', 'invert', 'zero']], 6), [[2, 5, 5, 5, 5, 5]])
if N == 4:
    check('explicit sequence 0', solve([['seed', [1, 2, 7, 0]], [[0], 1, 7, 7, 'equal', 'keep', 'zero']], 7), [[1, 2, 7, 0, 1, 2, 7]])
    check('explicit sequence 1', solve([['seed', [5]], [[0, 1], 1, 3, 7, 'equal', 'zero', 'keep']], 7), [[0, 0, 5, 5, 5, 5, 5]])
    check('explicit sequence 2', solve([['seed', [1]], [[0, 1], 2, 7, 7, 'less', 'replace', 'zero']], 7), [[2, 2, 1, 1, 1, 1, 1]])
    check('explicit sequence 3', solve([['seed', [0]], [[0, 1], 4, 0, 7, 'equal', 'replace', 'keep']], 7), [[4, 4, 0, 0, 0, 0, 0]])
    check('explicit sequence 4', solve([['seed', [7]], [[0, 1], 0, 7, 7, 'equal', 'keep', 'inc']], 7), [[7, 7, 7, 7, 7, 7, 7]])
    check('explicit sequence 5', solve([['seed', [0]], [[0, 1], 0, 7, 7, 'equal', 'dec', 'keep']], 7), [[0, 0, 0, 0, 0, 0, 0]])
    check('explicit sequence 6', solve([['seed', [3]], [[0, 1], 3, 7, 7, 'equal', 'invert', 'keep']], 7), [[4, 4, 3, 3, 3, 3, 3]])
    check('explicit sequence 7', solve([['seed', [6]], [[0, 1], 1, 7, 1, 'not', 'replace', 'zero']], 7), [[7, 7, 6, 6, 6, 6, 6]])
    check('explicit sequence 8', solve([['seed', [0]], [[], 0, 7, 7, 'equal', 'inc', 'keep']], 7), [[0, 0, 0, 0, 0, 0, 0]])
    check('explicit sequence 9', solve([['seed', [1]], [[0], 2, 7, 7, 'equal', 'zero', 'replace']], 7), [[2, 1, 1, 1, 1, 1, 1]])
    check('explicit sequence 10', solve([['seed', [1]], [[0, 2], 1, 7, 7, 'equal', 'zero', 'keep']], 7), [[0, 1, 0, 1, 1, 1, 1]])
    check('explicit sequence 11', solve([['seed', [2]], [[0], 2, 7, 7, 'less', 'zero', 'keep']], 7), [[2, 2, 2, 2, 2, 2, 2]])
    check('explicit sequence 12', solve([['seed', [5]], [[0], 1, 3, 7, 'equal', 'keep', 'zero']], 7), [[5, 5, 5, 5, 5, 5, 5]])
    check('explicit sequence 13', solve([['seed', [5]], [[0], 1, 3, 7, 'equal', 'inc', 'zero']], 7), [[6, 5, 5, 5, 5, 5, 5]])
    check('explicit sequence 14', solve([['seed', [5]], [[0], 1, 3, 7, 'equal', 'dec', 'zero']], 7), [[4, 5, 5, 5, 5, 5, 5]])
    check('explicit sequence 15', solve([['seed', [5]], [[0], 1, 3, 7, 'equal', 'invert', 'zero']], 7), [[2, 5, 5, 5, 5, 5, 5]])
if N == 5:
    check('explicit sequence 0', solve([['seed', [1, 2, 7, 0]], [[0], 1, 7, 7, 'equal', 'keep', 'zero']], 8), [[1, 2, 7, 0, 1, 2, 7, 0]])
    check('explicit sequence 1', solve([['seed', [5]], [[0, 1], 1, 3, 7, 'equal', 'zero', 'keep']], 8), [[0, 0, 5, 5, 5, 5, 5, 5]])
    check('explicit sequence 2', solve([['seed', [1]], [[0, 1], 2, 7, 7, 'less', 'replace', 'zero']], 8), [[2, 2, 1, 1, 1, 1, 1, 1]])
    check('explicit sequence 3', solve([['seed', [0]], [[0, 1], 4, 0, 7, 'equal', 'replace', 'keep']], 8), [[4, 4, 0, 0, 0, 0, 0, 0]])
    check('explicit sequence 4', solve([['seed', [7]], [[0, 1], 0, 7, 7, 'equal', 'keep', 'inc']], 8), [[7, 7, 7, 7, 7, 7, 7, 7]])
    check('explicit sequence 5', solve([['seed', [0]], [[0, 1], 0, 7, 7, 'equal', 'dec', 'keep']], 8), [[0, 0, 0, 0, 0, 0, 0, 0]])
    check('explicit sequence 6', solve([['seed', [3]], [[0, 1], 3, 7, 7, 'equal', 'invert', 'keep']], 8), [[4, 4, 3, 3, 3, 3, 3, 3]])
    check('explicit sequence 7', solve([['seed', [6]], [[0, 1], 1, 7, 1, 'not', 'replace', 'zero']], 8), [[7, 7, 6, 6, 6, 6, 6, 6]])
    check('explicit sequence 8', solve([['seed', [0]], [[], 0, 7, 7, 'equal', 'inc', 'keep']], 8), [[0, 0, 0, 0, 0, 0, 0, 0]])
    check('explicit sequence 9', solve([['seed', [1]], [[0], 2, 7, 7, 'equal', 'zero', 'replace']], 8), [[2, 1, 1, 1, 1, 1, 1, 1]])
    check('explicit sequence 10', solve([['seed', [1]], [[0, 2], 1, 7, 7, 'equal', 'zero', 'keep']], 8), [[0, 1, 0, 1, 1, 1, 1, 1]])
    check('explicit sequence 11', solve([['seed', [2]], [[0], 2, 7, 7, 'less', 'zero', 'keep']], 8), [[2, 2, 2, 2, 2, 2, 2, 2]])
    check('explicit sequence 12', solve([['seed', [5]], [[0], 1, 3, 7, 'equal', 'keep', 'zero']], 8), [[5, 5, 5, 5, 5, 5, 5, 5]])
    check('explicit sequence 13', solve([['seed', [5]], [[0], 1, 3, 7, 'equal', 'inc', 'zero']], 8), [[6, 5, 5, 5, 5, 5, 5, 5]])
    check('explicit sequence 14', solve([['seed', [5]], [[0], 1, 3, 7, 'equal', 'dec', 'zero']], 8), [[4, 5, 5, 5, 5, 5, 5, 5]])
    check('explicit sequence 15', solve([['seed', [5]], [[0], 1, 3, 7, 'equal', 'invert', 'zero']], 8), [[2, 5, 5, 5, 5, 5, 5, 5]])
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
explicit sequence 0	`[[1, 0, 0, 0]]`	`[[1, 2, 7, 0]]`	Failed
explicit sequence 1	`[[0, 0, 0, 0]]`	`[[0, 0, 5, 5]]`	Failed
explicit sequence 2	`[[2, 2, 2, 2]]`	`[[2, 2, 1, 1]]`	Failed
explicit sequence 3	`[[4, 4, 4, 4]]`	`[[4, 4, 0, 0]]`	Failed
explicit sequence 4	`[[7, 7, 7, 7]]`	`[[7, 7, 7, 7]]`	Passed
explicit sequence 5	`[[0, 0, 0, 0]]`	`[[0, 0, 0, 0]]`	Passed
explicit sequence 6	`[[4, 4, 4, 4]]`	`[[4, 4, 3, 3]]`	Failed
explicit sequence 7	`[[7, 7, 7, 7]]`	`[[7, 7, 6, 6]]`	Failed
explicit sequence 8	`[[0, 0, 0, 0]]`	`[[0, 0, 0, 0]]`	Passed
explicit sequence 9	`[[2, 2, 2, 2]]`	`[[2, 1, 1, 1]]`	Failed
explicit sequence 10	`[[0, 0, 0, 0]]`	`[[0, 1, 0, 1]]`	Failed
explicit sequence 11	`[[2, 2, 2, 2]]`	`[[2, 2, 2, 2]]`	Passed
explicit sequence 12	`[[5, 5, 5, 5]]`	`[[5, 5, 5, 5]]`	Passed
explicit sequence 13	`[[6, 6, 6, 6]]`	`[[6, 5, 5, 5]]`	Failed
explicit sequence 14	`[[4, 4, 4, 4]]`	`[[4, 5, 5, 5]]`	Failed
explicit sequence 15	`[[2, 2, 2, 2]]`	`[[2, 5, 5, 5]]`	Failed

SHA-256 / aacd5d0ceac89bdec79e12eb7ce5a9b93c4dc480edc6c51e96e8a5ba7ef7684d

2 / The unsuccessful fix

Exit 1

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

N = 1
observations = []
def solve(commands, size):
    values=[0]*size
    out=[]
    for cmd in commands:
        if cmd[0]=='seed': values=[cmd[1][i%len(cmd[1])] & 7 for i in range(size)]; continue
        mask,reference,readmask,writemask,comparison,onpass,onfail=cmd
        for i in range(size):
            if i<min(mask,default=size) or i>max(mask,default=-1): continue
            old=values[i]
            left=old & readmask
            right=reference & readmask
            passed=(left==right if comparison=='equal' else left<right if comparison=='less' else left!=right)
            op=onpass if passed else onfail
            if op=='keep': new=old
            elif op=='zero': new=0
            elif op=='replace': new=reference
            elif op=='inc': new=min(7,old+1)
            elif op=='dec': new=max(0,old-1)
            else: new=old^7
            values[i]=((old & (~writemask & 7)) | (new & writemask)) & 7
        out.append(list(values))
    return out
def check(label, actual, expected):
    observations.append({"check": label, "actual": actual, "expected": expected, "passed": actual == expected})
if N == 1:
    check('explicit sequence 0', solve([['seed', [1, 2, 7, 0]], [[0], 1, 7, 7, 'equal', 'keep', 'zero']], 4), [[1, 2, 7, 0]])
    check('explicit sequence 1', solve([['seed', [5]], [[0, 1], 1, 3, 7, 'equal', 'zero', 'keep']], 4), [[0, 0, 5, 5]])
    check('explicit sequence 2', solve([['seed', [1]], [[0, 1], 2, 7, 7, 'less', 'replace', 'zero']], 4), [[2, 2, 1, 1]])
    check('explicit sequence 3', solve([['seed', [0]], [[0, 1], 4, 0, 7, 'equal', 'replace', 'keep']], 4), [[4, 4, 0, 0]])
    check('explicit sequence 4', solve([['seed', [7]], [[0, 1], 0, 7, 7, 'equal', 'keep', 'inc']], 4), [[7, 7, 7, 7]])
    check('explicit sequence 5', solve([['seed', [0]], [[0, 1], 0, 7, 7, 'equal', 'dec', 'keep']], 4), [[0, 0, 0, 0]])
    check('explicit sequence 6', solve([['seed', [3]], [[0, 1], 3, 7, 7, 'equal', 'invert', 'keep']], 4), [[4, 4, 3, 3]])
    check('explicit sequence 7', solve([['seed', [6]], [[0, 1], 1, 7, 1, 'not', 'replace', 'zero']], 4), [[7, 7, 6, 6]])
    check('explicit sequence 8', solve([['seed', [0]], [[], 0, 7, 7, 'equal', 'inc', 'keep']], 4), [[0, 0, 0, 0]])
    check('explicit sequence 9', solve([['seed', [1]], [[0], 2, 7, 7, 'equal', 'zero', 'replace']], 4), [[2, 1, 1, 1]])
    check('explicit sequence 10', solve([['seed', [1]], [[0, 2], 1, 7, 7, 'equal', 'zero', 'keep']], 4), [[0, 1, 0, 1]])
    check('explicit sequence 11', solve([['seed', [2]], [[0], 2, 7, 7, 'less', 'zero', 'keep']], 4), [[2, 2, 2, 2]])
    check('explicit sequence 12', solve([['seed', [5]], [[0], 1, 3, 7, 'equal', 'keep', 'zero']], 4), [[5, 5, 5, 5]])
    check('explicit sequence 13', solve([['seed', [5]], [[0], 1, 3, 7, 'equal', 'inc', 'zero']], 4), [[6, 5, 5, 5]])
    check('explicit sequence 14', solve([['seed', [5]], [[0], 1, 3, 7, 'equal', 'dec', 'zero']], 4), [[4, 5, 5, 5]])
    check('explicit sequence 15', solve([['seed', [5]], [[0], 1, 3, 7, 'equal', 'invert', 'zero']], 4), [[2, 5, 5, 5]])
if N == 2:
    check('explicit sequence 0', solve([['seed', [1, 2, 7, 0]], [[0], 1, 7, 7, 'equal', 'keep', 'zero']], 5), [[1, 2, 7, 0, 1]])
    check('explicit sequence 1', solve([['seed', [5]], [[0, 1], 1, 3, 7, 'equal', 'zero', 'keep']], 5), [[0, 0, 5, 5, 5]])
    check('explicit sequence 2', solve([['seed', [1]], [[0, 1], 2, 7, 7, 'less', 'replace', 'zero']], 5), [[2, 2, 1, 1, 1]])
    check('explicit sequence 3', solve([['seed', [0]], [[0, 1], 4, 0, 7, 'equal', 'replace', 'keep']], 5), [[4, 4, 0, 0, 0]])
    check('explicit sequence 4', solve([['seed', [7]], [[0, 1], 0, 7, 7, 'equal', 'keep', 'inc']], 5), [[7, 7, 7, 7, 7]])
    check('explicit sequence 5', solve([['seed', [0]], [[0, 1], 0, 7, 7, 'equal', 'dec', 'keep']], 5), [[0, 0, 0, 0, 0]])
    check('explicit sequence 6', solve([['seed', [3]], [[0, 1], 3, 7, 7, 'equal', 'invert', 'keep']], 5), [[4, 4, 3, 3, 3]])
    check('explicit sequence 7', solve([['seed', [6]], [[0, 1], 1, 7, 1, 'not', 'replace', 'zero']], 5), [[7, 7, 6, 6, 6]])
    check('explicit sequence 8', solve([['seed', [0]], [[], 0, 7, 7, 'equal', 'inc', 'keep']], 5), [[0, 0, 0, 0, 0]])
    check('explicit sequence 9', solve([['seed', [1]], [[0], 2, 7, 7, 'equal', 'zero', 'replace']], 5), [[2, 1, 1, 1, 1]])
    check('explicit sequence 10', solve([['seed', [1]], [[0, 2], 1, 7, 7, 'equal', 'zero', 'keep']], 5), [[0, 1, 0, 1, 1]])
    check('explicit sequence 11', solve([['seed', [2]], [[0], 2, 7, 7, 'less', 'zero', 'keep']], 5), [[2, 2, 2, 2, 2]])
    check('explicit sequence 12', solve([['seed', [5]], [[0], 1, 3, 7, 'equal', 'keep', 'zero']], 5), [[5, 5, 5, 5, 5]])
    check('explicit sequence 13', solve([['seed', [5]], [[0], 1, 3, 7, 'equal', 'inc', 'zero']], 5), [[6, 5, 5, 5, 5]])
    check('explicit sequence 14', solve([['seed', [5]], [[0], 1, 3, 7, 'equal', 'dec', 'zero']], 5), [[4, 5, 5, 5, 5]])
    check('explicit sequence 15', solve([['seed', [5]], [[0], 1, 3, 7, 'equal', 'invert', 'zero']], 5), [[2, 5, 5, 5, 5]])
if N == 3:
    check('explicit sequence 0', solve([['seed', [1, 2, 7, 0]], [[0], 1, 7, 7, 'equal', 'keep', 'zero']], 6), [[1, 2, 7, 0, 1, 2]])
    check('explicit sequence 1', solve([['seed', [5]], [[0, 1], 1, 3, 7, 'equal', 'zero', 'keep']], 6), [[0, 0, 5, 5, 5, 5]])
    check('explicit sequence 2', solve([['seed', [1]], [[0, 1], 2, 7, 7, 'less', 'replace', 'zero']], 6), [[2, 2, 1, 1, 1, 1]])
    check('explicit sequence 3', solve([['seed', [0]], [[0, 1], 4, 0, 7, 'equal', 'replace', 'keep']], 6), [[4, 4, 0, 0, 0, 0]])
    check('explicit sequence 4', solve([['seed', [7]], [[0, 1], 0, 7, 7, 'equal', 'keep', 'inc']], 6), [[7, 7, 7, 7, 7, 7]])
    check('explicit sequence 5', solve([['seed', [0]], [[0, 1], 0, 7, 7, 'equal', 'dec', 'keep']], 6), [[0, 0, 0, 0, 0, 0]])
    check('explicit sequence 6', solve([['seed', [3]], [[0, 1], 3, 7, 7, 'equal', 'invert', 'keep']], 6), [[4, 4, 3, 3, 3, 3]])
    check('explicit sequence 7', solve([['seed', [6]], [[0, 1], 1, 7, 1, 'not', 'replace', 'zero']], 6), [[7, 7, 6, 6, 6, 6]])
    check('explicit sequence 8', solve([['seed', [0]], [[], 0, 7, 7, 'equal', 'inc', 'keep']], 6), [[0, 0, 0, 0, 0, 0]])
    check('explicit sequence 9', solve([['seed', [1]], [[0], 2, 7, 7, 'equal', 'zero', 'replace']], 6), [[2, 1, 1, 1, 1, 1]])
    check('explicit sequence 10', solve([['seed', [1]], [[0, 2], 1, 7, 7, 'equal', 'zero', 'keep']], 6), [[0, 1, 0, 1, 1, 1]])
    check('explicit sequence 11', solve([['seed', [2]], [[0], 2, 7, 7, 'less', 'zero', 'keep']], 6), [[2, 2, 2, 2, 2, 2]])
    check('explicit sequence 12', solve([['seed', [5]], [[0], 1, 3, 7, 'equal', 'keep', 'zero']], 6), [[5, 5, 5, 5, 5, 5]])
    check('explicit sequence 13', solve([['seed', [5]], [[0], 1, 3, 7, 'equal', 'inc', 'zero']], 6), [[6, 5, 5, 5, 5, 5]])
    check('explicit sequence 14', solve([['seed', [5]], [[0], 1, 3, 7, 'equal', 'dec', 'zero']], 6), [[4, 5, 5, 5, 5, 5]])
    check('explicit sequence 15', solve([['seed', [5]], [[0], 1, 3, 7, 'equal', 'invert', 'zero']], 6), [[2, 5, 5, 5, 5, 5]])
if N == 4:
    check('explicit sequence 0', solve([['seed', [1, 2, 7, 0]], [[0], 1, 7, 7, 'equal', 'keep', 'zero']], 7), [[1, 2, 7, 0, 1, 2, 7]])
    check('explicit sequence 1', solve([['seed', [5]], [[0, 1], 1, 3, 7, 'equal', 'zero', 'keep']], 7), [[0, 0, 5, 5, 5, 5, 5]])
    check('explicit sequence 2', solve([['seed', [1]], [[0, 1], 2, 7, 7, 'less', 'replace', 'zero']], 7), [[2, 2, 1, 1, 1, 1, 1]])
    check('explicit sequence 3', solve([['seed', [0]], [[0, 1], 4, 0, 7, 'equal', 'replace', 'keep']], 7), [[4, 4, 0, 0, 0, 0, 0]])
    check('explicit sequence 4', solve([['seed', [7]], [[0, 1], 0, 7, 7, 'equal', 'keep', 'inc']], 7), [[7, 7, 7, 7, 7, 7, 7]])
    check('explicit sequence 5', solve([['seed', [0]], [[0, 1], 0, 7, 7, 'equal', 'dec', 'keep']], 7), [[0, 0, 0, 0, 0, 0, 0]])
    check('explicit sequence 6', solve([['seed', [3]], [[0, 1], 3, 7, 7, 'equal', 'invert', 'keep']], 7), [[4, 4, 3, 3, 3, 3, 3]])
    check('explicit sequence 7', solve([['seed', [6]], [[0, 1], 1, 7, 1, 'not', 'replace', 'zero']], 7), [[7, 7, 6, 6, 6, 6, 6]])
    check('explicit sequence 8', solve([['seed', [0]], [[], 0, 7, 7, 'equal', 'inc', 'keep']], 7), [[0, 0, 0, 0, 0, 0, 0]])
    check('explicit sequence 9', solve([['seed', [1]], [[0], 2, 7, 7, 'equal', 'zero', 'replace']], 7), [[2, 1, 1, 1, 1, 1, 1]])
    check('explicit sequence 10', solve([['seed', [1]], [[0, 2], 1, 7, 7, 'equal', 'zero', 'keep']], 7), [[0, 1, 0, 1, 1, 1, 1]])
    check('explicit sequence 11', solve([['seed', [2]], [[0], 2, 7, 7, 'less', 'zero', 'keep']], 7), [[2, 2, 2, 2, 2, 2, 2]])
    check('explicit sequence 12', solve([['seed', [5]], [[0], 1, 3, 7, 'equal', 'keep', 'zero']], 7), [[5, 5, 5, 5, 5, 5, 5]])
    check('explicit sequence 13', solve([['seed', [5]], [[0], 1, 3, 7, 'equal', 'inc', 'zero']], 7), [[6, 5, 5, 5, 5, 5, 5]])
    check('explicit sequence 14', solve([['seed', [5]], [[0], 1, 3, 7, 'equal', 'dec', 'zero']], 7), [[4, 5, 5, 5, 5, 5, 5]])
    check('explicit sequence 15', solve([['seed', [5]], [[0], 1, 3, 7, 'equal', 'invert', 'zero']], 7), [[2, 5, 5, 5, 5, 5, 5]])
if N == 5:
    check('explicit sequence 0', solve([['seed', [1, 2, 7, 0]], [[0], 1, 7, 7, 'equal', 'keep', 'zero']], 8), [[1, 2, 7, 0, 1, 2, 7, 0]])
    check('explicit sequence 1', solve([['seed', [5]], [[0, 1], 1, 3, 7, 'equal', 'zero', 'keep']], 8), [[0, 0, 5, 5, 5, 5, 5, 5]])
    check('explicit sequence 2', solve([['seed', [1]], [[0, 1], 2, 7, 7, 'less', 'replace', 'zero']], 8), [[2, 2, 1, 1, 1, 1, 1, 1]])
    check('explicit sequence 3', solve([['seed', [0]], [[0, 1], 4, 0, 7, 'equal', 'replace', 'keep']], 8), [[4, 4, 0, 0, 0, 0, 0, 0]])
    check('explicit sequence 4', solve([['seed', [7]], [[0, 1], 0, 7, 7, 'equal', 'keep', 'inc']], 8), [[7, 7, 7, 7, 7, 7, 7, 7]])
    check('explicit sequence 5', solve([['seed', [0]], [[0, 1], 0, 7, 7, 'equal', 'dec', 'keep']], 8), [[0, 0, 0, 0, 0, 0, 0, 0]])
    check('explicit sequence 6', solve([['seed', [3]], [[0, 1], 3, 7, 7, 'equal', 'invert', 'keep']], 8), [[4, 4, 3, 3, 3, 3, 3, 3]])
    check('explicit sequence 7', solve([['seed', [6]], [[0, 1], 1, 7, 1, 'not', 'replace', 'zero']], 8), [[7, 7, 6, 6, 6, 6, 6, 6]])
    check('explicit sequence 8', solve([['seed', [0]], [[], 0, 7, 7, 'equal', 'inc', 'keep']], 8), [[0, 0, 0, 0, 0, 0, 0, 0]])
    check('explicit sequence 9', solve([['seed', [1]], [[0], 2, 7, 7, 'equal', 'zero', 'replace']], 8), [[2, 1, 1, 1, 1, 1, 1, 1]])
    check('explicit sequence 10', solve([['seed', [1]], [[0, 2], 1, 7, 7, 'equal', 'zero', 'keep']], 8), [[0, 1, 0, 1, 1, 1, 1, 1]])
    check('explicit sequence 11', solve([['seed', [2]], [[0], 2, 7, 7, 'less', 'zero', 'keep']], 8), [[2, 2, 2, 2, 2, 2, 2, 2]])
    check('explicit sequence 12', solve([['seed', [5]], [[0], 1, 3, 7, 'equal', 'keep', 'zero']], 8), [[5, 5, 5, 5, 5, 5, 5, 5]])
    check('explicit sequence 13', solve([['seed', [5]], [[0], 1, 3, 7, 'equal', 'inc', 'zero']], 8), [[6, 5, 5, 5, 5, 5, 5, 5]])
    check('explicit sequence 14', solve([['seed', [5]], [[0], 1, 3, 7, 'equal', 'dec', 'zero']], 8), [[4, 5, 5, 5, 5, 5, 5, 5]])
    check('explicit sequence 15', solve([['seed', [5]], [[0], 1, 3, 7, 'equal', 'invert', 'zero']], 8), [[2, 5, 5, 5, 5, 5, 5, 5]])
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
explicit sequence 0	`[[1, 2, 7, 0]]`	`[[1, 2, 7, 0]]`	Passed
explicit sequence 1	`[[0, 0, 5, 5]]`	`[[0, 0, 5, 5]]`	Passed
explicit sequence 2	`[[2, 2, 1, 1]]`	`[[2, 2, 1, 1]]`	Passed
explicit sequence 3	`[[4, 4, 0, 0]]`	`[[4, 4, 0, 0]]`	Passed
explicit sequence 4	`[[7, 7, 7, 7]]`	`[[7, 7, 7, 7]]`	Passed
explicit sequence 5	`[[0, 0, 0, 0]]`	`[[0, 0, 0, 0]]`	Passed
explicit sequence 6	`[[4, 4, 3, 3]]`	`[[4, 4, 3, 3]]`	Passed
explicit sequence 7	`[[7, 7, 6, 6]]`	`[[7, 7, 6, 6]]`	Passed
explicit sequence 8	`[[0, 0, 0, 0]]`	`[[0, 0, 0, 0]]`	Passed
explicit sequence 9	`[[2, 1, 1, 1]]`	`[[2, 1, 1, 1]]`	Passed
explicit sequence 10	`[[0, 0, 0, 1]]`	`[[0, 1, 0, 1]]`	Failed
explicit sequence 11	`[[2, 2, 2, 2]]`	`[[2, 2, 2, 2]]`	Passed
explicit sequence 12	`[[5, 5, 5, 5]]`	`[[5, 5, 5, 5]]`	Passed
explicit sequence 13	`[[6, 5, 5, 5]]`	`[[6, 5, 5, 5]]`	Passed
explicit sequence 14	`[[4, 5, 5, 5]]`	`[[4, 5, 5, 5]]`	Passed
explicit sequence 15	`[[2, 5, 5, 5]]`	`[[2, 5, 5, 5]]`	Passed

SHA-256 / 1a236d3a8abf847d8241764e00247c44c31d3a8c440ea4487101452666febc99

3 / The verified repair

Exit 0

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

N = 1
observations = []
def solve(commands, size):
    values=[0]*size
    out=[]
    for cmd in commands:
        if cmd[0]=='seed': values=[cmd[1][i%len(cmd[1])] & 7 for i in range(size)]; continue
        mask,reference,readmask,writemask,comparison,onpass,onfail=cmd
        for i in range(size):
            if i not in mask: continue
            old=values[i]
            left=old & readmask
            right=reference & readmask
            passed=(left==right if comparison=='equal' else left<right if comparison=='less' else left!=right)
            op=onpass if passed else onfail
            if op=='keep': new=old
            elif op=='zero': new=0
            elif op=='replace': new=reference
            elif op=='inc': new=min(7,old+1)
            elif op=='dec': new=max(0,old-1)
            else: new=old^7
            values[i]=((old & (~writemask & 7)) | (new & writemask)) & 7
        out.append(list(values))
    return out
def check(label, actual, expected):
    observations.append({"check": label, "actual": actual, "expected": expected, "passed": actual == expected})
if N == 1:
    check('explicit sequence 0', solve([['seed', [1, 2, 7, 0]], [[0], 1, 7, 7, 'equal', 'keep', 'zero']], 4), [[1, 2, 7, 0]])
    check('explicit sequence 1', solve([['seed', [5]], [[0, 1], 1, 3, 7, 'equal', 'zero', 'keep']], 4), [[0, 0, 5, 5]])
    check('explicit sequence 2', solve([['seed', [1]], [[0, 1], 2, 7, 7, 'less', 'replace', 'zero']], 4), [[2, 2, 1, 1]])
    check('explicit sequence 3', solve([['seed', [0]], [[0, 1], 4, 0, 7, 'equal', 'replace', 'keep']], 4), [[4, 4, 0, 0]])
    check('explicit sequence 4', solve([['seed', [7]], [[0, 1], 0, 7, 7, 'equal', 'keep', 'inc']], 4), [[7, 7, 7, 7]])
    check('explicit sequence 5', solve([['seed', [0]], [[0, 1], 0, 7, 7, 'equal', 'dec', 'keep']], 4), [[0, 0, 0, 0]])
    check('explicit sequence 6', solve([['seed', [3]], [[0, 1], 3, 7, 7, 'equal', 'invert', 'keep']], 4), [[4, 4, 3, 3]])
    check('explicit sequence 7', solve([['seed', [6]], [[0, 1], 1, 7, 1, 'not', 'replace', 'zero']], 4), [[7, 7, 6, 6]])
    check('explicit sequence 8', solve([['seed', [0]], [[], 0, 7, 7, 'equal', 'inc', 'keep']], 4), [[0, 0, 0, 0]])
    check('explicit sequence 9', solve([['seed', [1]], [[0], 2, 7, 7, 'equal', 'zero', 'replace']], 4), [[2, 1, 1, 1]])
    check('explicit sequence 10', solve([['seed', [1]], [[0, 2], 1, 7, 7, 'equal', 'zero', 'keep']], 4), [[0, 1, 0, 1]])
    check('explicit sequence 11', solve([['seed', [2]], [[0], 2, 7, 7, 'less', 'zero', 'keep']], 4), [[2, 2, 2, 2]])
    check('explicit sequence 12', solve([['seed', [5]], [[0], 1, 3, 7, 'equal', 'keep', 'zero']], 4), [[5, 5, 5, 5]])
    check('explicit sequence 13', solve([['seed', [5]], [[0], 1, 3, 7, 'equal', 'inc', 'zero']], 4), [[6, 5, 5, 5]])
    check('explicit sequence 14', solve([['seed', [5]], [[0], 1, 3, 7, 'equal', 'dec', 'zero']], 4), [[4, 5, 5, 5]])
    check('explicit sequence 15', solve([['seed', [5]], [[0], 1, 3, 7, 'equal', 'invert', 'zero']], 4), [[2, 5, 5, 5]])
if N == 2:
    check('explicit sequence 0', solve([['seed', [1, 2, 7, 0]], [[0], 1, 7, 7, 'equal', 'keep', 'zero']], 5), [[1, 2, 7, 0, 1]])
    check('explicit sequence 1', solve([['seed', [5]], [[0, 1], 1, 3, 7, 'equal', 'zero', 'keep']], 5), [[0, 0, 5, 5, 5]])
    check('explicit sequence 2', solve([['seed', [1]], [[0, 1], 2, 7, 7, 'less', 'replace', 'zero']], 5), [[2, 2, 1, 1, 1]])
    check('explicit sequence 3', solve([['seed', [0]], [[0, 1], 4, 0, 7, 'equal', 'replace', 'keep']], 5), [[4, 4, 0, 0, 0]])
    check('explicit sequence 4', solve([['seed', [7]], [[0, 1], 0, 7, 7, 'equal', 'keep', 'inc']], 5), [[7, 7, 7, 7, 7]])
    check('explicit sequence 5', solve([['seed', [0]], [[0, 1], 0, 7, 7, 'equal', 'dec', 'keep']], 5), [[0, 0, 0, 0, 0]])
    check('explicit sequence 6', solve([['seed', [3]], [[0, 1], 3, 7, 7, 'equal', 'invert', 'keep']], 5), [[4, 4, 3, 3, 3]])
    check('explicit sequence 7', solve([['seed', [6]], [[0, 1], 1, 7, 1, 'not', 'replace', 'zero']], 5), [[7, 7, 6, 6, 6]])
    check('explicit sequence 8', solve([['seed', [0]], [[], 0, 7, 7, 'equal', 'inc', 'keep']], 5), [[0, 0, 0, 0, 0]])
    check('explicit sequence 9', solve([['seed', [1]], [[0], 2, 7, 7, 'equal', 'zero', 'replace']], 5), [[2, 1, 1, 1, 1]])
    check('explicit sequence 10', solve([['seed', [1]], [[0, 2], 1, 7, 7, 'equal', 'zero', 'keep']], 5), [[0, 1, 0, 1, 1]])
    check('explicit sequence 11', solve([['seed', [2]], [[0], 2, 7, 7, 'less', 'zero', 'keep']], 5), [[2, 2, 2, 2, 2]])
    check('explicit sequence 12', solve([['seed', [5]], [[0], 1, 3, 7, 'equal', 'keep', 'zero']], 5), [[5, 5, 5, 5, 5]])
    check('explicit sequence 13', solve([['seed', [5]], [[0], 1, 3, 7, 'equal', 'inc', 'zero']], 5), [[6, 5, 5, 5, 5]])
    check('explicit sequence 14', solve([['seed', [5]], [[0], 1, 3, 7, 'equal', 'dec', 'zero']], 5), [[4, 5, 5, 5, 5]])
    check('explicit sequence 15', solve([['seed', [5]], [[0], 1, 3, 7, 'equal', 'invert', 'zero']], 5), [[2, 5, 5, 5, 5]])
if N == 3:
    check('explicit sequence 0', solve([['seed', [1, 2, 7, 0]], [[0], 1, 7, 7, 'equal', 'keep', 'zero']], 6), [[1, 2, 7, 0, 1, 2]])
    check('explicit sequence 1', solve([['seed', [5]], [[0, 1], 1, 3, 7, 'equal', 'zero', 'keep']], 6), [[0, 0, 5, 5, 5, 5]])
    check('explicit sequence 2', solve([['seed', [1]], [[0, 1], 2, 7, 7, 'less', 'replace', 'zero']], 6), [[2, 2, 1, 1, 1, 1]])
    check('explicit sequence 3', solve([['seed', [0]], [[0, 1], 4, 0, 7, 'equal', 'replace', 'keep']], 6), [[4, 4, 0, 0, 0, 0]])
    check('explicit sequence 4', solve([['seed', [7]], [[0, 1], 0, 7, 7, 'equal', 'keep', 'inc']], 6), [[7, 7, 7, 7, 7, 7]])
    check('explicit sequence 5', solve([['seed', [0]], [[0, 1], 0, 7, 7, 'equal', 'dec', 'keep']], 6), [[0, 0, 0, 0, 0, 0]])
    check('explicit sequence 6', solve([['seed', [3]], [[0, 1], 3, 7, 7, 'equal', 'invert', 'keep']], 6), [[4, 4, 3, 3, 3, 3]])
    check('explicit sequence 7', solve([['seed', [6]], [[0, 1], 1, 7, 1, 'not', 'replace', 'zero']], 6), [[7, 7, 6, 6, 6, 6]])
    check('explicit sequence 8', solve([['seed', [0]], [[], 0, 7, 7, 'equal', 'inc', 'keep']], 6), [[0, 0, 0, 0, 0, 0]])
    check('explicit sequence 9', solve([['seed', [1]], [[0], 2, 7, 7, 'equal', 'zero', 'replace']], 6), [[2, 1, 1, 1, 1, 1]])
    check('explicit sequence 10', solve([['seed', [1]], [[0, 2], 1, 7, 7, 'equal', 'zero', 'keep']], 6), [[0, 1, 0, 1, 1, 1]])
    check('explicit sequence 11', solve([['seed', [2]], [[0], 2, 7, 7, 'less', 'zero', 'keep']], 6), [[2, 2, 2, 2, 2, 2]])
    check('explicit sequence 12', solve([['seed', [5]], [[0], 1, 3, 7, 'equal', 'keep', 'zero']], 6), [[5, 5, 5, 5, 5, 5]])
    check('explicit sequence 13', solve([['seed', [5]], [[0], 1, 3, 7, 'equal', 'inc', 'zero']], 6), [[6, 5, 5, 5, 5, 5]])
    check('explicit sequence 14', solve([['seed', [5]], [[0], 1, 3, 7, 'equal', 'dec', 'zero']], 6), [[4, 5, 5, 5, 5, 5]])
    check('explicit sequence 15', solve([['seed', [5]], [[0], 1, 3, 7, 'equal', 'invert', 'zero']], 6), [[2, 5, 5, 5, 5, 5]])
if N == 4:
    check('explicit sequence 0', solve([['seed', [1, 2, 7, 0]], [[0], 1, 7, 7, 'equal', 'keep', 'zero']], 7), [[1, 2, 7, 0, 1, 2, 7]])
    check('explicit sequence 1', solve([['seed', [5]], [[0, 1], 1, 3, 7, 'equal', 'zero', 'keep']], 7), [[0, 0, 5, 5, 5, 5, 5]])
    check('explicit sequence 2', solve([['seed', [1]], [[0, 1], 2, 7, 7, 'less', 'replace', 'zero']], 7), [[2, 2, 1, 1, 1, 1, 1]])
    check('explicit sequence 3', solve([['seed', [0]], [[0, 1], 4, 0, 7, 'equal', 'replace', 'keep']], 7), [[4, 4, 0, 0, 0, 0, 0]])
    check('explicit sequence 4', solve([['seed', [7]], [[0, 1], 0, 7, 7, 'equal', 'keep', 'inc']], 7), [[7, 7, 7, 7, 7, 7, 7]])
    check('explicit sequence 5', solve([['seed', [0]], [[0, 1], 0, 7, 7, 'equal', 'dec', 'keep']], 7), [[0, 0, 0, 0, 0, 0, 0]])
    check('explicit sequence 6', solve([['seed', [3]], [[0, 1], 3, 7, 7, 'equal', 'invert', 'keep']], 7), [[4, 4, 3, 3, 3, 3, 3]])
    check('explicit sequence 7', solve([['seed', [6]], [[0, 1], 1, 7, 1, 'not', 'replace', 'zero']], 7), [[7, 7, 6, 6, 6, 6, 6]])
    check('explicit sequence 8', solve([['seed', [0]], [[], 0, 7, 7, 'equal', 'inc', 'keep']], 7), [[0, 0, 0, 0, 0, 0, 0]])
    check('explicit sequence 9', solve([['seed', [1]], [[0], 2, 7, 7, 'equal', 'zero', 'replace']], 7), [[2, 1, 1, 1, 1, 1, 1]])
    check('explicit sequence 10', solve([['seed', [1]], [[0, 2], 1, 7, 7, 'equal', 'zero', 'keep']], 7), [[0, 1, 0, 1, 1, 1, 1]])
    check('explicit sequence 11', solve([['seed', [2]], [[0], 2, 7, 7, 'less', 'zero', 'keep']], 7), [[2, 2, 2, 2, 2, 2, 2]])
    check('explicit sequence 12', solve([['seed', [5]], [[0], 1, 3, 7, 'equal', 'keep', 'zero']], 7), [[5, 5, 5, 5, 5, 5, 5]])
    check('explicit sequence 13', solve([['seed', [5]], [[0], 1, 3, 7, 'equal', 'inc', 'zero']], 7), [[6, 5, 5, 5, 5, 5, 5]])
    check('explicit sequence 14', solve([['seed', [5]], [[0], 1, 3, 7, 'equal', 'dec', 'zero']], 7), [[4, 5, 5, 5, 5, 5, 5]])
    check('explicit sequence 15', solve([['seed', [5]], [[0], 1, 3, 7, 'equal', 'invert', 'zero']], 7), [[2, 5, 5, 5, 5, 5, 5]])
if N == 5:
    check('explicit sequence 0', solve([['seed', [1, 2, 7, 0]], [[0], 1, 7, 7, 'equal', 'keep', 'zero']], 8), [[1, 2, 7, 0, 1, 2, 7, 0]])
    check('explicit sequence 1', solve([['seed', [5]], [[0, 1], 1, 3, 7, 'equal', 'zero', 'keep']], 8), [[0, 0, 5, 5, 5, 5, 5, 5]])
    check('explicit sequence 2', solve([['seed', [1]], [[0, 1], 2, 7, 7, 'less', 'replace', 'zero']], 8), [[2, 2, 1, 1, 1, 1, 1, 1]])
    check('explicit sequence 3', solve([['seed', [0]], [[0, 1], 4, 0, 7, 'equal', 'replace', 'keep']], 8), [[4, 4, 0, 0, 0, 0, 0, 0]])
    check('explicit sequence 4', solve([['seed', [7]], [[0, 1], 0, 7, 7, 'equal', 'keep', 'inc']], 8), [[7, 7, 7, 7, 7, 7, 7, 7]])
    check('explicit sequence 5', solve([['seed', [0]], [[0, 1], 0, 7, 7, 'equal', 'dec', 'keep']], 8), [[0, 0, 0, 0, 0, 0, 0, 0]])
    check('explicit sequence 6', solve([['seed', [3]], [[0, 1], 3, 7, 7, 'equal', 'invert', 'keep']], 8), [[4, 4, 3, 3, 3, 3, 3, 3]])
    check('explicit sequence 7', solve([['seed', [6]], [[0, 1], 1, 7, 1, 'not', 'replace', 'zero']], 8), [[7, 7, 6, 6, 6, 6, 6, 6]])
    check('explicit sequence 8', solve([['seed', [0]], [[], 0, 7, 7, 'equal', 'inc', 'keep']], 8), [[0, 0, 0, 0, 0, 0, 0, 0]])
    check('explicit sequence 9', solve([['seed', [1]], [[0], 2, 7, 7, 'equal', 'zero', 'replace']], 8), [[2, 1, 1, 1, 1, 1, 1, 1]])
    check('explicit sequence 10', solve([['seed', [1]], [[0, 2], 1, 7, 7, 'equal', 'zero', 'keep']], 8), [[0, 1, 0, 1, 1, 1, 1, 1]])
    check('explicit sequence 11', solve([['seed', [2]], [[0], 2, 7, 7, 'less', 'zero', 'keep']], 8), [[2, 2, 2, 2, 2, 2, 2, 2]])
    check('explicit sequence 12', solve([['seed', [5]], [[0], 1, 3, 7, 'equal', 'keep', 'zero']], 8), [[5, 5, 5, 5, 5, 5, 5, 5]])
    check('explicit sequence 13', solve([['seed', [5]], [[0], 1, 3, 7, 'equal', 'inc', 'zero']], 8), [[6, 5, 5, 5, 5, 5, 5, 5]])
    check('explicit sequence 14', solve([['seed', [5]], [[0], 1, 3, 7, 'equal', 'dec', 'zero']], 8), [[4, 5, 5, 5, 5, 5, 5, 5]])
    check('explicit sequence 15', solve([['seed', [5]], [[0], 1, 3, 7, 'equal', 'invert', 'zero']], 8), [[2, 5, 5, 5, 5, 5, 5, 5]])
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
explicit sequence 0	`[[1, 2, 7, 0]]`	`[[1, 2, 7, 0]]`	Passed
explicit sequence 1	`[[0, 0, 5, 5]]`	`[[0, 0, 5, 5]]`	Passed
explicit sequence 2	`[[2, 2, 1, 1]]`	`[[2, 2, 1, 1]]`	Passed
explicit sequence 3	`[[4, 4, 0, 0]]`	`[[4, 4, 0, 0]]`	Passed
explicit sequence 4	`[[7, 7, 7, 7]]`	`[[7, 7, 7, 7]]`	Passed
explicit sequence 5	`[[0, 0, 0, 0]]`	`[[0, 0, 0, 0]]`	Passed
explicit sequence 6	`[[4, 4, 3, 3]]`	`[[4, 4, 3, 3]]`	Passed
explicit sequence 7	`[[7, 7, 6, 6]]`	`[[7, 7, 6, 6]]`	Passed
explicit sequence 8	`[[0, 0, 0, 0]]`	`[[0, 0, 0, 0]]`	Passed
explicit sequence 9	`[[2, 1, 1, 1]]`	`[[2, 1, 1, 1]]`	Passed
explicit sequence 10	`[[0, 1, 0, 1]]`	`[[0, 1, 0, 1]]`	Passed
explicit sequence 11	`[[2, 2, 2, 2]]`	`[[2, 2, 2, 2]]`	Passed
explicit sequence 12	`[[5, 5, 5, 5]]`	`[[5, 5, 5, 5]]`	Passed
explicit sequence 13	`[[6, 5, 5, 5]]`	`[[6, 5, 5, 5]]`	Passed
explicit sequence 14	`[[4, 5, 5, 5]]`	`[[4, 5, 5, 5]]`	Passed
explicit sequence 15	`[[2, 5, 5, 5]]`	`[[2, 5, 5, 5]]`	Passed

SHA-256 / ade565d7d5442fb9c14e776f2729d6b3eab08199870554a910e4c6958b1e9cfc

Verification & scope

Finite one-dimensional integer sample sets model coverage state only; no geometric intersection, memory layout, GPU or graphics-standard conformance is claimed. 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 2026-09-29T14:45:10.602176+00:00.

Case digest / e8e55818b7d702970a9220f7e616feea629db81ecae89d21d56d9d5866122fc9