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