Romeo's lines in Romeo and Juliet compose a quatrain with an abab rhyme scheme.
Romeo's lines make up one quatrain, which uses an abab rhyme scheme.
In the exchange between Romeo and Juliet in Act I, scene v of Romeo and Juliet, Romeo's lines form a quatrain with an abab rhyme scheme. In a quatrain, there are four lines, and the rhyme scheme abab means that the first and third lines rhyme with each other, as well as the second and fourth lines.
This structure can be seen in Romeo's lines:
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