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 pencil with that he is writing broke.

SOLUTION: unacceptable

PROBLEM: Sam may have been being interrogated by the FBI.

SOLUTION: acceptable

PROBLEM: It is not true that that Bob was lying was obvious.

SOLUTION:
acceptable