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Better yet (and this seems to be the developers' intention), compose your poem in the window itself, and when you are stuck, Alt-click on the word for which you want a rhyme, place your cursor where you want the rhyme to appear,
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then click on the rhyme itself,
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and the rhyme will appear within your poem:
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I'm not sure this is the most efficient or effective way of writing poems, but I can see its value as a tool in the poet's arsenal. I can also see how it would serve as a great brain exerciser and vocabulary builder.