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