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