def key(
        seq: Sequence,
        tooth: Callable[[Sequence], str] = (
            lambda seq: str(random.SystemRandom().choice(seq)).strip()
        ),
        nteeth: int = 6,
        delimiter: str = ' ',
) -> str:
    """Concatenate strings generated by the tooth function."""
    return delimiter.join(tooth(seq) for _ in range(nteeth))
Concatenate strings generated by the tooth function.