And dVerse suggests this format -
Here's what Hobgoblin2011 has to allow about that one-off middle line:
The single line does not fit any of the criteria, it is thirteen-syllables (symbolic for bad luck) and delivers a third end rhyme (an odd number), one that will not find it’s match. So, in it, just by breaking form, we turn this line into the focus of the piece, it stands alone, and also acts as a recap of the stanza prior and a lead-in to the stanza yet to come. The fact it has no match is both symbolic of loneliness and foreshadows what will be. Then, there is the case of where the line is placed. The line splits the past and the future. It acts as a physical split to a poem where a break is indeed what takes place and lingers overhead, a symbol/metaphor once again. Yet being in between, it also adds symmetry and a mirrored effect, where the image is returned conversely.
I dig his involved conceptualization. So here's my (untitled) offering, which I'm also linking up with yeah write: