instruction:
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".
question:
Which book he read the book was that one.
answer:
unacceptable


question:
While Doc might claim that Bob had read his book, he won't the paper.
answer:
unacceptable


question:
We are aware of the existing problems.
answer:

acceptable