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".

Q: Sandy sang a song for me.

A: acceptable
****
Q: We went through the woods and over the bridge.

A: acceptable
****
Q: We believed there to be a fountain in the park.

A:
acceptable
****