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