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".

I shipped the package halfway around the world.
acceptable

The pirates drowned the sailor.
acceptable

Students studying English read Conrad's Heart of Darkness while at university.

acceptable