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 beer bubbled.
acceptable

The men would all not have been working.
unacceptable

I wrote a letter to Blair, but I tore it up before I sent it.

acceptable