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: Robert knows it is essential that he is well behaved.

SOLUTION: acceptable

PROBLEM: Here's the whisky which I went to the store and Mike bought.

SOLUTION: acceptable

PROBLEM: Tokyo has not loosened trade restrictions.

SOLUTION:
acceptable