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