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