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