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