Assertion: sonnet's theme | /r/HasProperty | developed until sonnet
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Source sentences:
text: This theme is developed until sonnet 18, where the narrator abandons it in favor of an alternative plan to eternalize the fair lord's beauty in his verse.
text: The themes of narcissism and usury (meant here as a form of use) are most developed in this sonnet, with its references to wills and testaments.