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 threw the ball to Mary, but she was looking at the birds flying overhead and didn't even notice.
acceptable

Heather cabled for Sara to come.
acceptable

When Mary listens to the Grateful Dead, she gets depressed.

acceptable