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]: Mary has never kissed a Man taller than John.
[EX A]: acceptable

[EX Q]: An oak tree will grow from that acorn.
[EX A]: acceptable

[EX Q]: That I believed that the sun was out is obvious.
[EX A]:
acceptable