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