你可以嘗試用樹狀圖喔！
| 想法1 | 想法2 | ||||||
| ABC ABD ABE ACB ACD ACE ADB ADC ADE |
BAC BAD BAE BCA BCD BCE BDA BDC BDE |
CAB CAD CAE CBA CBD CBE CDA CDB CDE |
DAB DAC DAE DBA DBC DBE DCA DCB DCE |
EAB EAC EAD EBA EBC EBD ECA ECB ECD |
ABC ABD ABE ACD ACE ADE |
BCD BCE BDE |
CDE |