X ( 1 , 25 , 2 , 24 ) X ( 2 , 48 , 3 , 47 ) X ( 5 , 29 , 6 , 28 ) X ( 6 , 52 , 7 , 51 ) X ( 9 , 33 , 10 , 32 ) X ( 10 , 56 , 11 , 55 ) X ( 13 , 37 , 14 , 36 ) X ( 14 , 60 , 15 , 59 ) X ( 17 , 41 , 18 , 40 ) X ( 18 , 64 , 19 , 63 ) X ( 21 , 45 , 22 , 44 ) X ( 22 , 68 , 23 , 67 ) X ( 25 , 49 , 26 , 48 ) X ( 26 , 4 , 27 , 3 ) X ( 29 , 53 , 30 , 52 ) X ( 30 , 8 , 31 , 7 ) X ( 33 , 57 , 34 , 56 ) X ( 34 , 12 , 35 , 11 ) X ( 37 , 61 , 38 , 60 ) X ( 38 , 16 , 39 , 15 ) X ( 41 , 65 , 42 , 64 ) X ( 42 , 20 , 43 , 19 ) X ( 45 , 1 , 46 , 68 ) X ( 46 , 24 , 47 , 23 ) X ( 49 , 5 , 50 , 4 ) X ( 50 , 28 , 51 , 27 ) X ( 53 , 9 , 54 , 8 ) X ( 54 , 32 , 55 , 31 ) X ( 57 , 13 , 58 , 12 ) X ( 58 , 36 , 59 , 35 ) X ( 61 , 17 , 62 , 16 ) X ( 62 , 40 , 63 , 39 ) X ( 65 , 21 , 66 , 20 ) X ( 66 , 44 , 67 , 43 ) {\displaystyle X(1,25,2,24)X(2,48,3,47)X(5,29,6,28)X(6,52,7,51)X(9,33,10,32)X(10,56,11,55)X(13,37,14,36)X(14,60,15,59)X(17,41,18,40)X(18,64,19,63)X(21,45,22,44)X(22,68,23,67)X(25,49,26,48)X(26,4,27,3)X(29,53,30,52)X(30,8,31,7)X(33,57,34,56)X(34,12,35,11)X(37,61,38,60)X(38,16,39,15)X(41,65,42,64)X(42,20,43,19)X(45,1,46,68)X(46,24,47,23)X(49,5,50,4)X(50,28,51,27)X(53,9,54,8)X(54,32,55,31)X(57,13,58,12)X(58,36,59,35)X(61,17,62,16)X(62,40,63,39)X(65,21,66,20)X(66,44,67,43)}
