Romeo's lines form a quatrain with an abab rhyme scheme in a Shakespearean sonnet.
Romeo's lines make up one quatrain, which uses an abab rhyme scheme. In a Shakespearean sonnet, there are fourteen lines written in iambic pentameter, organized into stanzas. Each quatrain typically follows an abab rhyme scheme, where the last words of the first and third lines rhyme, as do the last words of the second and fourth lines.
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