Answer:
The couplet is a popular poetic device. A couplet contains two lines of verse that usually rhyme, though this isn't required. The lines can be any length and use any rhythm. Sometimes the two lines are the same length, and sometimes one is longer than the other. Couplets are often used to end a stanza, but they can also constitute the whole poem. The choice depends on the effect the poet wants to create.
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