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