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