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