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