A Kyrielle is a French form of rhyming poetry written in quatrains (a stanza consisting of 4 lines), 
and each quatrain contains a repeating line or phrase as a refrain (usually appearing as the last 
line of each stanza). Each line within the poem consists of only eight syllables. There is no limit 
to the amount of stanzas a Kyrielle may have, but three is considered the accepted minimum. 
Some popular rhyming schemes for a Kyrielle are: aabB, ccbB, ddbB, with B being the repeated 
line, or abaB, cbcB, dbdB.
Mixing up the rhyme scheme is possible for an unusual pattern of: axaZ, bxbZ, cxcZ, dxdZ, etc. 
with Z being the repeated line. 
The rhyme pattern is completely up to the poet.
Many of my Kyrielles are actually Kyrielle Sonnets.  This is achieved by adding two more lines to
the standard twelve line Kyrielle form, with one of those lines being an extra refrain.