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".

I know which book Mag read, and which book Bob discussed after I had.
unacceptable

John wonders what Mary bought.
acceptable

The umpire fell off the deck.

acceptable