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]: Thunder frightens the dog.
[EX A]: acceptable

[EX Q]: Ellen conferred with Helen.
[EX A]: acceptable

[EX Q]: Students who fail the final exam or who do not do the reading will be executed.
[EX A]:
acceptable