Tanka
consist of five syllabic
units containing
thirty-one syllables
in the pattern
5-7-5-7-7.
http://www.asahi-net.or.jp/~EA8T-MNK/english.html
http://etext.virginia.edu/japanese/
"Blues Stanza: A
triplet stanza
derived from
the Black jazz
tradition of
lamentation or
complaint,
rhyming AAa.
Usually written
in loose iambic
pentameter
measures, the
second line
an incremental
repetition of
the first, the
third line a
synthetic
parallel giving
a consequence
of the first two
lines." Turko,
The New Book
of Forms.