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: Calvin had been eating.

A: acceptable
****
Q: John has often kissed Mary.

A: acceptable
****
Q: The lawyer looked into the document.

A:
acceptable
****