Hi again!
Thanks so much! 
As i donāt understand very much the function of ālist itemā, i tried to do your defintion, without the function ālist itemā, that i put here.
But, could you please explain me, how this function is working, because, what i donāt understand, is that in input, we have two closed planar curves, and, at the input, it is written that we have only one closed curve. But, It seems that, in the output, from one side, we have the end point of the bigger section curve, and, from other side, we have the bigger section curve that enters in the input of the function āmirrorā. So, i donāt understand, how, from the function ālist itemā, we can choose only the bigger section curve, and not choose, the smaller?
Thanks so much 26FevForum_reNoList.gh (9.7 KB)