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]: Robert knows it is essential that he is well behaved.
[EX A]: acceptable

[EX Q]: Mag Wildwood came to introduce the bartender but I came precisely not to.
[EX A]: acceptable

[EX Q]: There is a riot in the park.
[EX A]:
acceptable