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".
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Question: We proved conclusively Smith to be the thief.

Answer: unacceptable


Question: Smith inscribed the ring with his name.

Answer: acceptable


Question: The stone knocked the cup apart.

Answer:
acceptable