a := ( 1,38)( 2,48)( 3,78)( 4,46)( 5,70)( 6,20)( 7,37)( 8,83)( 9,57)(10,76)
(11,47)(12,17)(13,15)(14,23)(16,81)(18,41)(19,51)(21,31)(22,33)(24,61)(25,62)
(26,34)(27,56)(28,50)(29,77)(30,59)(32,44)(35,67)(36,58)(39,75)(40,82)(42,54)
(43,84)(45,68)(49,79)(52,60)(53,64)(55,65)(63,72)(66,80)(69,74)(71,73);