a-a a-b aaa aab aaf aak aam aan aar aau ab- aba abb abf abk abm abn abr abu af- afa afb aff afk afm afn afr afu aka akb akk akm akn akr aku ama amb amf amk amm amn amr amu an- ana anb anf ank anm ann anr anu ar- ara arb arf ark arm arn arr aru au- aua aub auf auk aum aun aur b-u baa bab baf bak bam ban bar bau bba bbb bbf bbk bbm bbn bbr bbu bfa bfb bff bfm bfn bfr bfu bka bkb bkf bkk bkm bkn bkr bma bmb bmf bmk bmm bmn bmr bmu bna bnb bnf bnk bnn bnr bnu bra brb brf brk brm brn brr bru bua bub buf buk bum bun bur buu faa fab faf fak fam fan far fau fba fbb fbf fbk fbm fbn fbr fbu ffa fff ffk ffm ffn ffr ffu fka fkb fkf fkk fkm fma fmb fmf fmm fmn fmr fmu fna fnb fnf fnk fnm fnn fnr fnu fra frb frf frk frm frn frr fru fua fub fuf fuk fum fun fur fuu ka- kaa kab kaf kak kam kan kar kau kba kbb kbf kbk kbm kbn kbr kbu kfa kff kfm kfu kkb kkk kkm kkn kkr kku kma kmb kmf kmk kmm kmu kn- kna knf knk knm knn knr knu kra krf krk krn krr kru kub kuk kum kun kur kuu m-f m-r maa mab maf mak mam man mar mau mba mbb mbf mbk mbm mbr mbu mfa mfb mff mfm mfn mfr mfu mka mkb mkk mkm mkn mkr mku mma mmb mmf mmk mmm mmn mmr mmu mna mnb mnf mnk mnm mnn mnr mnu mra mrb mrf mrk mrm mrn mrr mru mua mub muf muk mum mun mur muu naa nab naf nak nam nan nar nau nba nbb nbf nbk nbm nbn nbr nbu nfa nfb nff nfk nfn nfr nfu nka nkf nkk nkm nkn nkr nku nma nmb nmk nmm nmn nmr nmu nna nnb nnf nnk nnm nnn nnu nra nrb nrf nrk nrm nrn nrr nru nua nub nuk num nun nur nuu ra- raa rab raf rak ram ran rar rau rba rbb rbf rbk rbm rbn rbr rbu rfa rfb rff rfk rfm rfn rfr rfu rkb rkf rkk rkm rku rma rmb rmf rmm rmn rmr rna rnb rnm rnn rnr rnu rra rrb rrf rrk rrm rrn rrr rru rua rub ruf ruk rum run rur ruu ua- uaa uab uaf uak uam uan uar uau uba ubb ubf ubk ubn ubr ubu ufa uff ufm ufn ufr ufu uka ukb ukf ukk ukn ukr uku um- uma umb umf umm umn umr umu un- una unb unf unk unm unn unr unu ur- ura urb urf urk urm urn urr uru uua uum uun uur uuu