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