represent lines repeated verbatim)
* Chastushka: ABAB, ABCB, or AABB
* Cinquain: ABABB
* Clerihew: AABB
* Couplet: AA, but usually occurs as AA BB CC DD ...
* Décima: ABBAACCDDC
* Double dactyl: XXXA XXXA
* Enclosed rhyme (or enclosing rhyme): ABBA
* Englyn: