a := ( 1, 8)( 2,13)( 3,21)( 4,73)( 5,52)( 6,28)( 7,56)( 9,83)(10,45)(11,64)
(12,26)(14,53)(15,81)(16,57)(17,36)(18,88)(19,43)(20,87)(22,89)(23,79)(24,47)
(27,58)(29,71)(30,86)(31,74)(32,40)(33,60)(34,70)(35,78)(37,54)(38,80)(39,75)
(41,46)(42,48)(44,59)(49,76)(50,65)(51,82)(55,72)(61,67)(62,85)(63,68)(66,90)
(69,77);