[(0,1),(0,2),(2,3),(3,4),(1,5),(4,6),(5,7),(6,8),(3,8),(5,9),(7,10),(10,11),(9,12),(1,12),(10,13),(11,14),(2,15),(8,16),(7,17),(9,18),(6,19),(12,20),(4,21),(11,22)]
[(0,1),(0,2),(1,3),(3,4),(2,5),(4,6),(4,7),(3,8),(6,9),(2,9),(8,10),(1,11),(10,11),(5,12),(12,13),(6,14),(7,15),(12,16),(5,17),(11,18),(10,19),(8,20),(7,21),(9,22)]
