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: Cynthia lunched.

Answer: acceptable


Question: Mary's happy with her work, and John's with his children.

Answer: acceptable


Question: Bill believes Anna and himself to be similar.

Answer:
unacceptable