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Rubber-duck a bug

Forces the model to reason about the system instead of pattern-matching a generic fix.

Help me debug. Don't guess at a fix yet.

What happens: [the actual behavior, error message, stack trace]
What I expected: [the correct behavior]
What I've tried: [attempts so far]
Relevant code:
```
[PASTE]
```

First: list the 3 most likely root causes ranked by probability, and for each, the ONE thing I should check to confirm or rule it out. Wait for my answer before proposing fixes.
Open in ChatGPT Claude

Works with Claude · ChatGPT · Gemini — replace the [bracketed] parts with your own details, keep the structure.

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