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