a := ( 1,60)( 2,62)( 3,13)( 4,40)( 5,52)( 6,29)( 7,39)( 8,48)( 9,27)(10,57)
(12,19)(14,54)(15,26)(16,18)(17,42)(20,45)(21,30)(22,58)(23,55)(24,38)(25,28)
(31,61)(32,41)(33,56)(34,37)(35,53)(36,47)(43,50)(44,46)(49,59);