def key(<EOL>seq: Sequence,<EOL>tooth: Callable[[Sequence], str] = (<EOL>lambda seq: str(random.SystemRandom().choice(seq)).strip()<EOL>),<EOL>nteeth: int = <NUM_LIT:6>,<EOL>delimiter: str = '<STR_LIT:U+0020>',<EOL>) -> str:
return delimiter.join(tooth(seq) for _ in range(nteeth))<EOL>
Concatenate strings generated by the tooth function.