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