This was also used in the Contest of Gregory Barden. Here are the details of his invented form:
Here is the Qarinage's rhyme pattern (also entered in Gregory's contest):
At least TWO verses of the following rhyme scheme, ABBACCDD + Refrain, (the refrain repeats after every verse), with syllable counts of 10,5,5,10,5,5,11,11 + 6, (6 is the refrain), and the LAST verse must have an EXTRA line of rhyme (D, 11 syllables), and an extra line of refrain, (6 syllables), that is different but rhymes.