FA-3976 / Text processing / Open access

Stopword removal deletes a substring of another word · case 01

Stopword removal deletes a substring of another word.

Verified by executionVariant 1 · 4 checks per implementationDownload source bundle ↓JSON ↗

ROOT CAUSE

The implementation applies an operation whose text or grammar semantics violate this contract: Remove exact lowercase word the from whitespace-delimited words; preserve other words and case.

VERIFIED REPAIR

Implement the complete stated contract, including the boundary fixtures: Remove exact lowercase word the from whitespace-delimited words; preserve other words and case.

Unsuccessful approach: The attempted repair handles the primary example but still violates a separate boundary of the same contract.

Case contract

Remove exact lowercase word the from whitespace-delimited words; preserve other words and case.

Why this case matters

A local executable model for consumers of structured text; oracle values are authored literals, not outputs copied from the repaired implementation.

1 / The failure

Exit 1

"""Failure Map reference implementation. Python standard library only."""
import json
import re, unicodedata, json, csv, io, html, base64, binascii, codecs, struct
from urllib.parse import quote, unquote, unquote_to_bytes, urlencode, parse_qsl, urlsplit, urlunsplit
from email.header import decode_header, make_header
from email.utils import getaddresses
from xml.etree import ElementTree as ET
import shlex, string, textwrap

N = 1
observations = []
def solve(x):
    try:
        return x.replace('the','').split()
    except Exception as exc:
        return {"error": type(exc).__name__}
def check(label, actual, expected):
    observations.append({"check": label, "actual": actual, "expected": expected, "passed": actual == expected})
check('boundary 1', solve('other the'), ['other'])
check('boundary 2', solve('The the'), ['The'])
check('boundary 3', solve('theatre'), ['theatre'])
check('boundary 4', solve(''), [])
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
boundary 1	`['or']`	`['other']`	Failed
boundary 2	`['The']`	`['The']`	Passed
boundary 3	`['atre']`	`['theatre']`	Failed
boundary 4	`[]`	`[]`	Passed

SHA-256 / 24ba6abf65c2c0acf5b27d319c64e95cd25ce009e3ba5534f9e6893c60af8961

2 / The unsuccessful fix

Exit 1

"""Failure Map reference implementation. Python standard library only."""
import json
import re, unicodedata, json, csv, io, html, base64, binascii, codecs, struct
from urllib.parse import quote, unquote, unquote_to_bytes, urlencode, parse_qsl, urlsplit, urlunsplit
from email.header import decode_header, make_header
from email.utils import getaddresses
from xml.etree import ElementTree as ET
import shlex, string, textwrap

N = 1
observations = []
def solve(x):
    try:
        return [v for v in x.split() if v.lower()!='the']
    except Exception as exc:
        return {"error": type(exc).__name__}
def check(label, actual, expected):
    observations.append({"check": label, "actual": actual, "expected": expected, "passed": actual == expected})
check('boundary 1', solve('other the'), ['other'])
check('boundary 2', solve('The the'), ['The'])
check('boundary 3', solve('theatre'), ['theatre'])
check('boundary 4', solve(''), [])
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
boundary 1	`['other']`	`['other']`	Passed
boundary 2	`[]`	`['The']`	Failed
boundary 3	`['theatre']`	`['theatre']`	Passed
boundary 4	`[]`	`[]`	Passed

SHA-256 / f0fa515cab2516ebdbf3b9c16d2719e63f04ec02cbe8d67b25ae39f9d1e08995

3 / The verified repair

Exit 0

"""Failure Map reference implementation. Python standard library only."""
import json
import re, unicodedata, json, csv, io, html, base64, binascii, codecs, struct
from urllib.parse import quote, unquote, unquote_to_bytes, urlencode, parse_qsl, urlsplit, urlunsplit
from email.header import decode_header, make_header
from email.utils import getaddresses
from xml.etree import ElementTree as ET
import shlex, string, textwrap

N = 1
observations = []
def solve(x):
    try:
        return [v for v in x.split() if v!='the']
    except Exception as exc:
        return {"error": type(exc).__name__}
def check(label, actual, expected):
    observations.append({"check": label, "actual": actual, "expected": expected, "passed": actual == expected})
check('boundary 1', solve('other the'), ['other'])
check('boundary 2', solve('The the'), ['The'])
check('boundary 3', solve('theatre'), ['theatre'])
check('boundary 4', solve(''), [])
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
boundary 1	`['other']`	`['other']`	Passed
boundary 2	`['The']`	`['The']`	Passed
boundary 3	`['theatre']`	`['theatre']`	Passed
boundary 4	`[]`	`[]`	Passed

SHA-256 / 45a81e07990291704560642dc93a06badd4f0fb0e41fad62ab4bf3720d288f95

Verification & scope

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 2026-09-29T14:37:33.642965+00:00.

Case digest / 9c5421ee053df4bf92ec87a67addd71594cd7c8d96ebac0f661559f5173acebc