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]: Lee solved the puzzle how Kim solved it.
[A]: unacceptable


[Q]: I am not certain about whether he will go or not.
[A]: acceptable


[Q]: Stephen is believed to be easy to annoy Ben.
[A]:
unacceptable