12345,12354,12435,12453,12534,1254313254,13245,13425,13452,13524,1354214235,14253,14325,14352,14523,1453215234,15243,15324,15342,15423,1543221345,21354,21435,21453,21534,2154323145,23154,23415,23451,23514,2354124135,24153,24315,24351,24513,2453125134,25143,25314,25341,25413,2543131245,31254,31425,31452,31524,3154232145,32154,32415,32451,32514,3254134125,34152,34215,34251,34512,3452135124,35142,35214,35241,35412,3542141235,41253,41325,41352,41523,4153242135,42153,42315,42351,42513,4253143125,43152,43215,43251,43512,4352145123,45132,45213,45231,45312,4532151234,51243,51324,51342,51423,5143252134,52143,52314,52341,52413,5243153124,53142,53214,53241,53412,5342154123,54132,54213,54231,54312,54321所以共有6×20=120種