[(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)]
[(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)]
