-er a-a a-b aaa aab aae aaf aam aan aar aau aax ab- aba abb abe abf abm abn abr abu abx aea aeb aee aef aem aen aer aeu aex af- afa afb afe aff afm afn afr afu afx ama amb ame amf amm amn amr amu amx an- ana anb ane anf anm ann anr anu anx ar- ara arb are arf arm arn arr aru arx au- aua aub aue auf aum aun aur aux ax- axa axe axm axn axr axx b-u baa bab bae baf bam ban bar bau bax bba bbb bbe bbf bbm bbn bbr bbu bbx be- bea beb bee bef bem ben ber beu bex bfa bfb bfe bff bfm bfn bfr bfu bfx bma bmb bme bmf bmm bmn bmr bmu bmx bna bnb bne bnf bnn bnr bnu bnx bra brb bre brf brm brn brr bru brx bua bub bue buf bum bun bur buu bux bxb bxm bxn bxx eaa eab eae eaf eam ean ear eau eax eba ebb ebe ebf ebm ebn ebr ebu ebx eea eeb eee eef eem een eer eex ef- efa efb efe eff efm efr efx em- ema emb eme emf emm emn emr emu emx en- ena enb ene enf enm enn enr enu era erb ere erf erm ern err eru eu- eua eub eue euf eun eur eux ex- exa exe exr exu exx faa fab fae faf fam fan far fau fax fba fbb fbe fbf fbm fbn fbr fbu fbx fea feb fee fef fem fen fer feu fex ffa ffe fff ffm ffn ffr ffu ffx fma fmb fme fmf fmm fmn fmr fmu fmx fna fnb fne fnf fnm fnn fnr fnu fnx fra frb fre frf frm frn frr fru fua fub fue fuf fum fun fur fuu fux fxe fxm fxr fxu fxx m-f m-r maa mab mae maf mam man mar mau max mba mbb mbe mbf mbm mbr mbu mbx mea meb mee mef mem men mer meu mex mfa mfb mfe mff mfm mfn mfr mfu mma mmb mme mmf mmm mmn mmr mmu mmx mna mnb mne mnf mnm mnn mnr mnu mra mrb mre mrf mrm mrn mrr mru mrx mua mub mue muf mum mun mur muu mux mxa mxn mxr mxu naa nab nae naf nam nan nar nau nax nba nbb nbe nbf nbm nbn nbr nbu nbx ne- nea neb nee nef nem nen ner neu nex nfa nfb nfe nff nfn nfr nfu nma nmb nme nmm nmn nmr nmu nna nnb nne nnf nnm nnn nnu nra nrb nre nrf nrm nrn nrr nru nrx nua nub nue num nun nur nuu nux ra- raa rab rae raf ram ran rar rau rax rba rbb rbe rbf rbm rbn rbr rbu rbx re- rea reb ree ref rem ren rer reu rex rfa rfb rfe rff rfm rfn rfr rfu rma rmb rme rmf rmm rmn rmr rmx rna rnb rnm rnn rnr rnu rra rrb rrf rrm rrn rrr rru rua rub rue ruf rum run rur ruu rux rxr ua- uaa uab uae uaf uam uan uar uau uba ubb ube ubf ubn ubr ubu ubx uea ueb uee uef uem uen uer ufa ufe uff ufm ufn ufr ufu ufx um- uma umb ume umf umm umn umr umu un- una unb une unf unm unn unr unu unx ur- ura urb ure urf urm urn urr uru urx uua uue uum uun uur uuu uxb uxf uxr uxu xaa xaf xam xan xar xau xbe xbr xbx xee xem xen xer xeu xex xfa xfe xfm xfn xfx xma xmf xmm xmr xmu xmx xna xnu xrf xrx xue xun xxx