False. A poem can have internal rhyme (rhyme within a line) without necessarily following a structured rhyme scheme. Internal rhyme adds to the musicality and flow of a poem, but it is not a requirement for a specific rhyme scheme.
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"The Raven" by Edgar Allan Poe features end rhyme, internal rhyme, slant rhyme, and a consistent rhyme scheme (ABCBBB).
"Stopping by Woods on a Snowy Evening" by Robert Frost contains end rhyme, internal rhyme, and a structured rhyme scheme (AABA).
"The Waste Land" by T.S. Eliot utilizes slant rhyme, end rhyme, and internal rhyme throughout the poem, with varied rhyme schemes in each section.