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