bcb-0022

1.000

8/8 tests· lib-knowledge

Proposed solution

```python
import collections
from itertools import zip_longest
from random import choices

def task_func(l1, l2, K=10):
    combined = [x for pair in zip_longest(l1, l2, fillvalue=None) for x in pair if x is not None]
    sample = choices(combined, k=K)
    return collections.Counter(sample)
```

Test output (stdout)

........                                                                 [100%]
8 passed in 0.02s

System prompt

You are an expert programmer. Solve the task exactly as specified. Output your solution as fenced code blocks using the required file name(s) and the exact function/type signatures requested. Prefer correctness; do not include prose outside code unless asked.