Assertion: sonnet's quatrain | /r/HasProperty | three quatrains
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Source sentences:
text: Many of his sonnets in the sequence, for instance, impose the thematic pattern of a Petrarchan sonnet onto the formal pattern of a Shakespearean sonnet, so that while there are still three quatrains and a couplet, the first two quatrains might ask a single question, which the third quatrain and the couplet will answer.