[(0,1),(0,2),(1,2),(1,3),(3,4),(4,5),(3,6),(4,6),(5,7),(6,8),(2,8),(5,9),(8,10),(7,11),(7,12)]
[(0,1),(1,2),(2,3),(0,4),(2,4),(3,5),(1,6),(4,7),(6,7),(6,8),(7,8),(8,9),(3,10),(5,11),(5,12)]
