Sedoka

“The Sedoka is a Japanese form poem. It is a variation of a form called a Mondo. This form consists of two stanzas called Katauta. A Katauta is a 3 line stanza with a sylible count of 5 - 7 - 7. The first stanza of a Sedoka touches on one subject, and the second goes a little deeper into that subject.” 
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“Sedoka is a Japanese verse form that evolved from ancient songs. They can be mood poems, similar to tanka, or they can tell stories in the manner of a song. Sedoka consist of 6 lines of 5-7-7-5-7-7 syllables respectively. Each 5-7-7 unit is called a katauta. Traditionally, the second katauta says the same thing as the first katauta, although in a different way. In modern English the syllable count is somewhat more flexible, and there is usually a turn, or change in direction, in lines 3 and 5. The turn in line 3 is sharp, and the turn in line 5 is gentle.” 
http://www.nhi.clara.net/hkfaq.htm

SEDOKA - INTRODUCTION & SELECTIONS
John Daleiden, US
http://www.worldhaikureview.org/5-1/whcpb/whcpbsedokacontentsdaleiden.htm