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