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".

Bob proved that this set is recursive.
acceptable

The lions ate at the meat raw.
unacceptable

The jeweller copied the name on the ring.

acceptable