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".
--------
Question: Sam may have been being interrogated by the FBI.

Answer: acceptable


Question: The pirates drowned the sailor.

Answer: acceptable


Question: That piano, which the boy's playing loudly drove everyone crazy, was badly out of tune.

Answer:
unacceptable