Mid-Swap
Created by England’s Jenny Buzzard, this form requires adherance to a strict structure. It contains four quatrains with a center couplet, at a syllable count of eight per line. The rhyme scheme is: A1abb ccdd A2A1 eeff ggaA2 Or, to put that in an example: Start out with a line in rhyme “A,” XXXXXXXa XXXXXXXb XXXXXXXb XXXXXXXc XXXXXXXc XXXXXXXd XXXXXXXd Do once more a line in rhyme “A.” Start out with a line in rhyme “A.” XXXXXXXe XXXXXXXe XXXXXXXf XXXXXXXf XXXXXXXg XXXXXXXg XXXXXXXa Do once more a line in rhyme “A.”
Pasted from http://the.a.b.c.of.poetry.styles.patthepoet.com/ItoN.html