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 believed that he is honest.
[EX A]: acceptable

[EX Q]: Much of that theory is unfounded.
[EX A]: acceptable

[EX Q]: The ship's sinking to collect the insurance was very devious.
[EX A]:
unacceptable