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