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