These rhyme patterns have various effects, and can be used to:

* Control flow: If every line has the same rhyme (AAAA), the stanza will read as having a very quick flow, whereas a rhyme scheme like ABCABC can be felt to unfold more slowly.
* Structure a poem's message and thought patterns: For example, a simple couplet with a rhyme scheme of AABB lends itself to simpler direct ideas, because the resolution comes in the very next line. Essentially these couplets can be thought of as self-contained statements. This idea of rhyme