Concept
Bounding real ports in every symbol group
Choose one label coordinate and one symbol. Exactly a fraction 1/r of all ordered label pairs use that symbol on the row side, and likewise on the column side. Since every class has H_pad padded positions, each side has at most H_pad D_arr/r<=3M/r REAL ports with that symbol. The bound holds for every coordinate, not only one chosen in advance. Combining both sides gives at most 6M/r ports in a group. This will bound child wires; it is not a bound on how many graph vertices have that symbol.
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Updated 2026-11-08
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Math