2 choices for the 1st one times 2 choices for the 2nd one times 2 choices for the 3rd one times 2 choices for the 4th one times 2 choices for the 5th one. 2 = 25 = 32 1. AAAAA 2. AAAAB 3. AAABA 4. AAABB 5. AABAA 6. AABAB 7. AABBA 8. AABBB 9. ABAAA 10. ABAAB 11. ABABA 12. ABABB 13. ABBAA 14. ABBAB 15. ABBBA 16. ABBBB 17. BAAAA 18. BAAAB 19. BAABA 20. BAABB 21. BABAA 22. BABAB 23. BABBA 24. BABBB 25. BBAAA 26. BBAAB 27. BBABA 28. BBABB 29. BBBAA 30. BBBAB 31. BBBBA 32. BBBBB Edwin