You're given a sentence and your task is to classify whether the sentence is acceptable or not. Any sentence which is grammatically correct, has a naturalistic text, is written by a native speaker and which minimizes superfluous content is acceptable, otherwise unacceptable. If the sentence is acceptable then write "acceptable", otherwise "unacceptable".

Q: John must do not have eaten.

A: unacceptable
****
Q: I'll work on it if I can work on it.

A: acceptable
****
Q: The children amused at the clown.

A:
unacceptable
****