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