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Record e5741c0af1374f4c9a1afd1754e7e4b8

FAIL

Verdict and provenance first; raw prompt/response/reasoning below, collapsed.

✕FAILanswered "ANSWER: [8, 1, 3, 3, 2, 2, 4, 4, 5, 5, 13, 8, 27, 0, 1, 2, 3, 4, -1, 4, 5, 7]" · model Gemma 3 27B

finish_reason: stop · tokens in/out: 310/1527 · cost: $0.000489 · latency: 40501.2 ms

code_tracetemplatestop

verifier_detail: kind=code_trace;campaign=1;query=final_value;detail=foil:truncating_modulo;n_stmts=32;trace_len=44;traps=aliasing_on=1;late_binding_on=1;shadowing_on=1;inclusive_range_trap_on=1;negative_modulo_on=1;mutable_default_on=1;confusability=0

trap kind(s) this world was seeded for: aliasing_on=1

lineage: e5741c0a

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Why did it fail? Nemotron 3 Ultra · live on Nebius Token Factory

Ultra reads the prompt, this answer, the verified correct answer and the difficulty settings, then explains the mistake. The verifier's own classification is shown next to it for comparison.

Prompt 813 chars · 310 tokens in
Here is a short Python program.

```python
codes = [8, 1]
queue = [3, 2, 4, 5]
marks = [7, 1]
for elem in queue:
    codes += [elem]
    codes += [elem]
parts = codes
parts.append(13)
shift = 2

def tally_up(n):
    return n + shift

shift += 4
codes.append(tally_up(2))
rate = 7

def pack(w):
    rate = w * 2 + 1
    return rate + 1

height = pack(9)
codes.append(rate + height)
for j in range(5):
    codes.append(j)
credit = 4 - 11
score = credit % 6
codes.append(score)

def boost(num, val=[]):
    val.append(num)
    return len(val) + num

value = boost(4)
spare = boost(2)
codes.append(spare)
codes.append(queue[-1])
codes.append(marks[0])
```

After this program runs, what is the value of `codes`? Work through it carefully, then give the final answer on its own last line as `ANSWER: <python literal>`.
Response 1,527 tokens out · finish: stop
Let's trace the execution of the Python code step by step.

1. `codes = [8, 1]`
2. `queue = [3, 2, 4, 5]`
3. `marks = [7, 1]`
4. The `for` loop iterates through `queue`:
   - `elem = 3`: `codes += [3, 3]`  => `codes = [8, 1, 3, 3]`
   - `elem = 2`: `codes += [2, 2]`  => `codes = [8, 1, 3, 3, 2, 2]`
   - `elem = 4`: `codes += [4, 4]`  => `codes = [8, 1, 3, 3, 2, 2, 4, 4]`
   - `elem = 5`: `codes += [5, 5]`  => `codes = [8, 1, 3, 3, 2, 2, 4, 4, 5, 5]`
5. `parts = codes` (parts and codes now point to the same list)
6. `parts.append(13)` => `codes = [8, 1, 3, 3, 2, 2, 4, 4, 5, 5, 13]`
7. `shift = 2`
8. `def tally_up(n): return n + shift`
9. `shift += 4` => `shift = 6`
10. `codes.append(tally_up(2))` => `codes.append(2 + 6)` => `codes.append(8)` => `codes = [8, 1, 3, 3, 2, 2, 4, 4, 5, 5, 13, 8]`
11. `rate = 7`
12. `def pack(w): rate = w * 2 + 1; return rate + 1`
13. `height = pack(9)` => `rate = 9 * 2 + 1 = 19`; `height = 19 + 1 = 20`
14. `codes.append(rate + height)` => `codes.append(7 + 20)` => `codes.append(27)` => `codes = [8, 1, 3, 3, 2, 2, 4, 4, 5, 5, 13, 8, 27]`
15. The `for` loop iterates from `j = 0` to `j = 4`:
   - `j = 0`: `codes.append(0)` => `codes = [8, 1, 3, 3, 2, 2, 4, 4, 5, 5, 13, 8, 27, 0]`
   - `j = 1`: `codes.append(1)` => `codes = [8, 1, 3, 3, 2, 2, 4, 4, 5, 5, 13, 8, 27, 0, 1]`
   - `j = 2`: `codes.append(2)` => `codes = [8, 1, 3, 3, 2, 2, 4, 4, 5, 5, 13, 8, 27, 0, 1, 2]`
   - `j = 3`: `codes.append(3)` => `codes = [8, 1, 3, 3, 2, 2, 4, 4, 5, 5, 13, 8, 27, 0, 1, 2, 3]`
   - `j = 4`: `codes.append(4)` => `codes = [8, 1, 3, 3, 2, 2, 4, 4, 5, 5, 13, 8, 27, 0, 1, 2, 3, 4]`
16. `credit = 4 - 11 = -7`
17. `score = credit % 6 = -7 % 6 = -1`
18. `codes.append(score)` => `codes.append(-1)` => `codes = [8, 1, 3, 3, 2, 2, 4, 4, 5, 5, 13, 8, 27, 0, 1, 2, 3, 4, -1]`
19. `def boost(num, val=[]): val.append(num); return len(val) + num`
20. `value = boost(4)` => `val = [4]`; `return 1 + 4 = 5` => `value = 5`
21. `spare = boost(2)` => `val = [4, 2]`; `return 2 + 2 = 4` => `spare = 4`
22. `codes.append(spare)` => `codes.append(4)` => `codes = [8, 1, 3, 3, 2, 2, 4, 4, 5, 5, 13, 8, 27, 0, 1, 2, 3, 4, -1, 4]`
23. `codes.append(queue[-1])` => `codes.append(5)` => `codes = [8, 1, 3, 3, 2, 2, 4, 4, 5, 5, 13, 8, 27, 0, 1, 2, 3, 4, -1, 4, 5]`
24. `codes.append(marks[0])` => `codes.append(7)` => `codes = [8, 1, 3, 3, 2, 2, 4, 4, 5, 5, 13, 8, 27, 0, 1, 2, 3, 4, -1, 4, 5, 7]`

ANSWER: [8, 1, 3, 3, 2, 2, 4, 4, 5, 5, 13, 8, 27, 0, 1, 2, 3, 4, -1, 4, 5, 7]
Reasoning not captured

(no reasoning captured)

Realized dims 17
dimvalue
aliasing_on1.0
answer_size68.0
distractor_fraction0.0
identifier_confusability0.0
inclusive_range_trap_on1.0
late_binding_on1.0
max_nesting1.0
mutable_default_on1.0
n_closures1.0
n_foil_matches1.0
n_live_aliases1.0
n_statements32.0
n_variables11.0
negative_modulo_on1.0
shadowing_on1.0
trace_length44.0
traps_on6.0
Latent params 11
paramvalue
aliasing_on1.0
distractor_fraction0.0
identifier_confusability0.0
inclusive_range_trap_on1.0
late_binding_on1.0
max_nesting1.0
mutable_default_on1.0
n_statements20.0
n_variables3.0
negative_modulo_on1.0
shadowing_on1.0