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