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Verifies that all keys and values in `current_env` do not contain illegal keys or values, and returns a list of
strings as the result.
Example:
```python
>>> from accelerate.utils.environment import verify_env
>>> env = {"ACCELERATE_DEBUG_MODE": "1", "BAD_ENV_NAME": "<mything", "OTHER_ENV": "2"}
>>> valid_env_items = verify_env(env)
>>> print(valid_env_items)
["ACCELERATE_DEBUG_MODE=1
", "OTHER_ENV=2
"]
```
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