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".
--------
Question: The electrode was struck by ions.

Answer: acceptable


Question: Which problem do you wonder whether John said that Mary solved?

Answer: unacceptable


Question: They rowed the canals of Venice.

Answer:
acceptable