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: The oil separated from the vinegar.

SOLUTION: acceptable

PROBLEM: An oak tree will grow from that acorn.

SOLUTION: acceptable

PROBLEM: What city will Fred say that Mary thinks that John lives?

SOLUTION:
unacceptable