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