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