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