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".

Martha carved a piece of wood into a toy for the baby.
acceptable

John has often kissed Mary.
acceptable

This is how he did it.

acceptable