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