[(0,1),(1,2),(2,3),(1,3),(2,4),(3,5),(0,5),(5,6),(6,7),(6,8),(4,9),(4,10)]
[(0,1),(0,2),(2,3),(1,3),(2,4),(1,4),(3,5),(5,6),(5,7),(6,8),(4,9),(6,10)]
