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