The definition I sent works but you need to make GRAFT on surfaces to create a branch for each surface.
Manuel definition is really much better and shorter (less graphic but).
I send you the problem solved. I think so...
Imagine you have to make a flower, so you have to weave the petals. First you need to have the even and odd petals and then weave both.
I thought it was easier but it was a bit tricky. Perhaps…"