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".

Willy is taller than Bill by as much as I know a boy who thinks that Bill is taller than Dan.
unacceptable

He's a man to whom liberty we could never grant.
acceptable

Sandy taught the children the alphabet, but only got as far as the letter `` r ''.

acceptable