{0,1,2,1,5,6,7,6,10,11,12,11,15,16,17,16},{15,16,17,16,0,1,2,1,5,6,7,6,10,11,12,11},{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}