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".

[Q]: What proof that he has implicated have you found?
[A]: acceptable


[Q]: Copper rods bend easily.
[A]: acceptable


[Q]: The children are seen in the yard.
[A]:
acceptable