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, 11 , 0, 16 , 0, 20 , 0, 68 , 0, 85 , 0, 118 , 1, 19 , 1, 30 , 1, 33 , 1, 40 , 1, 45 , 1, 53 , 1, 64 , 1, 70 , 1, 81 , 1, 93 , 1, 103 , 1, 105 , 1…