construct/nppc three coloring

construct/nppc three coloring: a task in MathConstructOptimize-Envs-harbor (Harbor dataset). Graph with 10 vertices labelled 0..9 and edge list 0, 1 , 0, 2 , 0, 4 , 0, 8 , 1, 3 , 1, 4 , 1, 9 , 2, 6 , 2, 7 , 2, 9 , 3, 6 , 3, 7 , 3, 8 , 4, 5 , 4, 7 , 4, 8 , 6, 8 , 7, 8 , 7, 9 , 8, 9