a := ( 1,38)( 2,17)( 3,28)( 4,15)( 5,35)( 6,24)( 7,31)( 8,20)( 9,40)(10,27)
(11,18)(12,21)(13,33)(14,29)(16,32)(19,25)(22,42)(23,39)(26,41)(30,36)(34,43)
(37,44);