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