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from typing import Any
def flatten(xs: dict[str, Any], parent_key: str, separator: str) -> dict[str, Any]:
if not xs:
return {}
items: list[tuple[str, Any]] = []
for k, v in xs.items():
new_key = parent_key + separator + k if parent_key else k
if isinstance(v, dict):
items.extend(flatten(v, new_key, separator).items())
else:
items.append((new_key, v))
return dict(items)
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