If a,b,c are three values in a line, then a+b is greater than or equal to c.

Consider e1-complement. There must be six side exits. First and last are either

c3-e1 or g3-e1. Others are side-to-side or side-to-interior.

Above shows that 3 side exits must be side-to-side and 1 must be side-to-interior.

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