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