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: Bill understands Mary and himself.

A: unacceptable
****
Q: Pat persuaded Leslie to be aggressive.

A: acceptable
****
Q: This is the kind of person who I doubt that under normal circumstances would have anything to do with such a scheme.

A:
acceptable
****