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: Who do you think that Mary said that John likes?

A: acceptable
****
Q: The tool that Jones got was more helpful than the one that Smith got.

A: acceptable
****
Q: This conclusion to be arrived at is surprising.

A:
unacceptable
****