construct/nppc three coloring

construct/nppc three coloring: a task in MathConstructOptimize-Envs-harbor (Harbor dataset). Graph with 120 vertices labelled 0..119 and edge list 0, 13 , 0, 16 , 0, 45 , 0, 64 , 0, 66 , 0, 72 , 0, 91 , 0, 99 , 0, 104 , 0, 109 , 0, 116 , 1, 15 , 1, 20 , 1, 33 , 1, 45 , 1, 50 , 1, 56 , 1, 60 , 1…