{0,1,0,2,5,6,5,7,10,11,10,12,15,16,15,17},{15,16,15,17,0,1,0,2,5,6,5,7,10,11,10,12},{0,3,4,4,5,8,9,9,10,13,14,14,15,18,19,19},{15,18,19,19,0,3,4,4,5,8,9,9,10,13,14,14}