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