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".

[EX Q]: John is prouder of having gone than John didn't expect me to believe he would be.
[EX A]: unacceptable

[EX Q]: Who do you think that Mary said that John likes?
[EX A]: acceptable

[EX Q]: No man has ever beaten the centaur.
[EX A]:
acceptable