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