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