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]: the enemy's destruction of the city was horrific.
[EX A]: acceptable

[EX Q]: John must do not have eaten.
[EX A]: unacceptable

[EX Q]: What do you believe that iron is to be a fact well known to virtually everybody?
[EX A]:
unacceptable