X ( 1 , 29 , 2 , 28 ) X ( 3 , 31 , 4 , 30 ) X ( 5 , 33 , 6 , 32 ) X ( 7 , 35 , 8 , 34 ) X ( 9 , 37 , 10 , 36 ) X ( 11 , 39 , 12 , 38 ) X ( 13 , 41 , 14 , 40 ) X ( 15 , 43 , 16 , 42 ) X ( 17 , 45 , 18 , 44 ) X ( 19 , 47 , 20 , 46 ) X ( 21 , 49 , 22 , 48 ) X ( 23 , 51 , 24 , 50 ) X ( 25 , 53 , 26 , 52 ) X ( 27 , 1 , 28 , 54 ) X ( 29 , 3 , 30 , 2 ) X ( 31 , 5 , 32 , 4 ) X ( 33 , 7 , 34 , 6 ) X ( 35 , 9 , 36 , 8 ) X ( 37 , 11 , 38 , 10 ) X ( 39 , 13 , 40 , 12 ) X ( 41 , 15 , 42 , 14 ) X ( 43 , 17 , 44 , 16 ) X ( 45 , 19 , 46 , 18 ) X ( 47 , 21 , 48 , 20 ) X ( 49 , 23 , 50 , 22 ) X ( 51 , 25 , 52 , 24 ) X ( 53 , 27 , 54 , 26 ) {\displaystyle X(1,29,2,28)X(3,31,4,30)X(5,33,6,32)X(7,35,8,34)X(9,37,10,36)X(11,39,12,38)X(13,41,14,40)X(15,43,16,42)X(17,45,18,44)X(19,47,20,46)X(21,49,22,48)X(23,51,24,50)X(25,53,26,52)X(27,1,28,54)X(29,3,30,2)X(31,5,32,4)X(33,7,34,6)X(35,9,36,8)X(37,11,38,10)X(39,13,40,12)X(41,15,42,14)X(43,17,44,16)X(45,19,46,18)X(47,21,48,20)X(49,23,50,22)X(51,25,52,24)X(53,27,54,26)}
