Fix Even Numbers

The model receives the prompt (and optional system message). The run uses scorer contains_all with the JSON configuration below. Pass/fail and partial credit are determined entirely by that scorer against the model output; no human grading.

The following Python function is supposed to return only even numbers from a list, but it contains a bug. Explain the bug briefly and provide the corrected code only.

```python
def get_even_numbers(nums):
    result = []
    for n in nums:
        if n % 2 == 1:
            result.append(n)
    return result
```

{
  "expected_contains": [
    "n % 2 == 0",
    "def get_even_numbers(nums):",
    "return result"
  ]
}