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