TASK DEFINITION: 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".
PROBLEM: When can we register for graduation?

SOLUTION: acceptable

PROBLEM: John looked up the meaning of ` chanson '.

SOLUTION: acceptable

PROBLEM: John mentioned the issue to me.

SOLUTION:
acceptable