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