X ( 3 , 8 , 4 , 9 ) X ( 4 , 15 , 1 , 16 ) X ( 5 , 21 , 6 , 20 ) X ( 6 , 1 , 7 , 2 ) X ( 9 , 22 , 10 , 19 ) X ( 11 , 5 , 12 , 18 ) X ( 13 , 2 , 14 , 3 ) X ( 14 , 7 , 15 , 8 ) X ( 17 , 11 , 18 , 10 ) X ( 19 , 12 , 20 , 13 ) X ( 21 , 17 , 22 , 16 ) {\displaystyle X(3,8,4,9)X(4,15,1,16)X(5,21,6,20)X(6,1,7,2)X(9,22,10,19)X(11,5,12,18)X(13,2,14,3)X(14,7,15,8)X(17,11,18,10)X(19,12,20,13)X(21,17,22,16)}
