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