-ra

Explanation

1. -ra
(formal, highly addressee-lowering) A sentence-final ending used when demanding a certain act of readers or listeners who are not mentioned in detail, in newspapers, books, etc.

2. -ra
(formal, highly addressee-lowering) A sentence-final ending used to indicate a statement as a command.

Examples
청춘이여, 영원하라!
마음을 열어 하늘을 보라
다음 중 맞는 답을 고르라

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