Division the surface

Grasshopper
1

I have an L-shaped screen and I want to make divisions on it.
How to remove these parts

2020-05-19_23-37-06
2020-05-19_23-37-06547×671 23.7 KB

2

removing faces through boundary
removing faces through boundary1240×620 109 KB
unnamed.gh (7.1 KB)

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