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Frame the paper's purpose: ask whether two constructive families of 4-colorable triangulations -- bridge-derived level graphs (parity 2-coloring) and intertwining trees (two trees, disjoint color pairs) -- suffice to generate every maximal planar graph on n vertices. An affirmative answer would be a constructive proof of the four color theorem for triangulations. State the duality bridge to Tait/Holton-McKay and the n=21 confirmation. Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>
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