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 have some voice exercises to play the guitar and sing.
unacceptable

She held him by the arm.
acceptable

She always clad herself in black.

unacceptable