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