Why these boxes don't disappear?

Grasshopper
1

I want to delete boxes in that box. but didn’t.
solid difference also not work.box.gh (12.5 KB)

rr
rr1566×638 176 KB

Help plz

2

You need to internalize the curve and post the file again or post a Rhino file with that curve.

image
image1694×589 53.4 KB

3

To just delete the boxes inside the other box you can doi it like this:

image
image1720×581 132 KB

box.gh (29.2 KB)

4

Thank U for notice about rule and grasshopper.
Very Thank U ^-^