Literary device. Very useful. Used for effect. Creates rhythm.

Chunk of a sentence, as opposed to a whole one. Sometimes just a noun phrase. Also can be a predicate with no subject. Or a sentence no verb. Very abrupt. Not the same as nonsense, as meaning can be had from context.

Good grammar in Japanesebad grammar in English. Common in casual speech, though. Also at the beginning of definitions and E2 writeups. Sometimes, all the way through.

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