The Shakespearean sonnet has the rhyme scheme ABAB CDCD EFEF GG, forming three quatrains (four lines in a group) and a closing couplet (two rhymed lines). The problem is usually developed in the first three quatrains, each quatrain with a new idea growing out of the previous one.
sonnet 18 no 4
"So long as men can breathe or eyes can see,
So long lives this, and this gives life to thee."
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