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