Bref Double
The Bref Double has strong resemblances with the Sonnet, but the difference is it doesn’t require a specific meter, and the rhyme scheme is different. The Bref Double is written in three quatrains (4 lines in one stanza) and a couplet (2 lines in a stanza) and uses the following rhyme scheme:
a-x-b-c
x-a-x-c
a-x-a-b
a-b
The x stands for a line that doesn’t rhyme with any of the other lines.