a-a a-b aaa aab aaf aah aar aau ab- aba abb abf abh abr abu af- afa afb aff afh afr afu aha ahb ahf ahh ahr ahu ar- ara arb arf arh arr aru au- aua aub auf auh aur b-u baa bab baf bah bar bau bba bbb bbf bbh bbr bbu bfa bfb bff bfh bfr bfu bha bhb bhf bhh bhr bhu bra brb brf brh brr bru bua bub buf buh bur buu faa fab faf fah far fau fba fbb fbf fbh fbr fbu ffa fff ffh ffr ffu fha fhb fhf fhh fhr fra frb frf frh frr fru fua fub fuf fur fuu haa hab haf hah har hau hba hbb hbf hbh hbr hbu hfa hfb hff hfh hfr hfu hha hhb hhf hhh hhr hhu hr- hra hrb hrf hrh hrr hru hua hub huf huh hur huu ra- raa rab raf rah rar rau rba rbb rbf rbh rbr rbu rfa rfb rff rfh rfr rfu rh- rha rhb rhf rhh rhr rhu rra rrb rrf rrh rrr rru rua rub ruf ruh rur ruu ua- uaa uab uaf uah uar uau uba ubb ubf ubh ubr ubu ufa uff ufh ufr ufu uha uhb uhf uhh uhr uhu ur- ura urb urf urr uru uua uur uuu