instruction:
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".
question:
the pencil with that he is writing broke.
answer:
unacceptable


question:
The problem knows easily.
answer:
unacceptable


question:
There is likely to be a letter in the mailbox.
answer:

acceptable