Selecting four sides of irregular, planar, rectangle based shape

Grasshopper
1

Hi,

I have an almost regular rectangle - but want to be able to select each whole string of curves before the 90degree angle is turned:

image
image998×773 10.8 KB

irregular rectangle side selection.gh (2.7 KB)

2

Canvas at 22;36;11
Canvas at 22;36;111743×706 116 KB

irregular rectangle side selection_re.gh (14.3 KB)