X ( 1 , 11 , 2 , 10 ) X ( 4 , 24 , 5 , 23 ) X ( 5 , 15 , 6 , 14 ) X ( 8 , 28 , 9 , 27 ) X ( 9 , 19 , 10 , 18 ) X ( 12 , 4 , 13 , 3 ) X ( 13 , 23 , 14 , 22 ) X ( 16 , 8 , 17 , 7 ) X ( 17 , 27 , 18 , 26 ) X ( 20 , 12 , 21 , 11 ) X ( 21 , 3 , 22 , 2 ) X ( 24 , 16 , 25 , 15 ) X ( 25 , 7 , 26 , 6 ) X ( 28 , 20 , 1 , 19 ) {\displaystyle X(1,11,2,10)X(4,24,5,23)X(5,15,6,14)X(8,28,9,27)X(9,19,10,18)X(12,4,13,3)X(13,23,14,22)X(16,8,17,7)X(17,27,18,26)X(20,12,21,11)X(21,3,22,2)X(24,16,25,15)X(25,7,26,6)X(28,20,1,19)}
