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