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".

The critique of Plato's Republic was written from a contemporary point of view.
acceptable

Ellen conferred with Helen.
acceptable

Heidi said that pictures of herself were embarrassing.

acceptable