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".

The five `` soundscape '' pieces gave a festive air to Park Square.
acceptable

John seems know about the bananas.
unacceptable

That the principal would fire some teacher was expected by the reporters.

acceptable