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