456.7 465.7 475.6 476.5 457.6 467.5
546.7 547.6 567.4 564.7 576.4 574.6
645.7 647.5 654.7 657.4 674.5 675.4
745.6 746.5 754.6 756.4 764.5 765.4
4*3*2*1=24(种)
456.7 465.7 475.6 476.5 457.6 467.5
546.7 547.6 567.4 564.7 576.4 574.6
645.7 647.5 654.7 657.4 674.5 675.4
745.6 746.5 754.6 756.4 764.5 765.4
4*3*2*1=24(种)