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".

[EX Q]: They widely believed that John was ill.
[EX A]: acceptable

[EX Q]: In the church sang a choir.
[EX A]: acceptable

[EX Q]: Willy is taller than Bill by as much as I know a boy who thinks that Bill is taller than Dan.
[EX A]:
unacceptable