Getting inside surface, not the outside

Grasshopper
1

How can I get the inside instead of the outside?

getting inside surface 01.gh (3.3 KB)

getting%20inside%20surface%2001
getting%20inside%20surface%20011615×619 72.3 KB

2

Canvas%20at%2004%3B31%3B29
Canvas at 04;31;29.png845×242 98.7 KB
getting inside surface 01_re.gh (6.1 KB)

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