a := ( 1, 4)( 2,48)( 3, 7)( 5,21)( 6,64)( 8,30)( 9,19)(10,69)(11,56)(12,20)
(13,14)(15,50)(16,35)(17,36)(18,27)(22,44)(23,66)(24,72)(25,34)(26,62)(28,52)
(29,58)(31,47)(32,40)(33,43)(37,74)(38,39)(41,68)(42,55)(45,49)(46,60)(51,71)
(53,73)(54,59)(61,63)(65,70);