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]: It is this hat that it is certain that he was wearing.
[A]: acceptable


[Q]: Jean is likely to leave.
[A]: acceptable


[Q]: Would John hate that!
[A]:
acceptable