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".

An oak tree will grow from that acorn.
acceptable

Heidi gave a present to herself.
acceptable

The child was never deceived.

acceptable