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