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