a-a a-b aaa aab aae aaf aam aan aao aau ab- aba abb abe abf abm abn abo abu aea aeb aee aef aem aen aeo aeu af- afa afb afe aff afm afn afo afu ama amb ame amf amm amn amo amu an- ana anb ane anf anm ann ano anu aoa aob aoe aof aom aon aoo aou au- aua aub aue auf aum aun auo b-u baa bab bae baf bam ban bao bau bba bbb bbe bbf bbm bbn bbo bbu be- bea beb bee bef bem ben beo beu bfa bfb bfe bff bfm bfn bfo bfu bma bmb bme bmf bmm bmn bmo bmu bna bnb bne bnf bnn bno bnu boa bob boe bof bom bon boo bou bua bub bue buf bum bun buo buu eaa eab eae eaf eam ean eao eau eba ebb ebe ebf ebm ebn ebo ebu eea eeb eee eef eem een eeo ef- efa efb efe eff efm efo em- ema emb eme emf emm emn emo emu en- ena enb ene enf enm enn eno enu eo- eoa eob eoe eof eom eon eoo eou eu- eua eub eue euf eun faa fab fae faf fam fan fao fau fba fbb fbe fbf fbm fbn fbo fbu fea feb fee fef fem fen feo feu ffa ffe fff ffm ffn ffo ffu fma fmb fme fmf fmm fmn fmo fmu fna fnb fne fnf fnm fnn fnu foa fob foe fof fom fon foo fou fua fub fue fuf fum fun fuo fuu m-f m-o maa mab mae maf mam man mao mau mba mbb mbe mbf mbm mbo mbu mea meb mee mef mem men meo meu mfa mfb mfe mff mfm mfn mfo mfu mma mmb mme mmf mmm mmn mmo mmu mna mnb mne mnf mnm mnn mno mnu moa mob moe mof mom mon moo mou mua mub mue muf mum mun muu naa nab nae naf nam nan nao nau nba nbb nbe nbf nbm nbn nbo nbu ne- nea neb nee nef nem nen neo neu nfa nfb nfe nff nfn nfo nfu nma nmb nme nmm nmn nmo nmu nna nnb nne nnf nnm nnn nno nnu no- noa nob noe nof nom non noo nou nua nub nue num nun nuo nuu oaa oab oae oaf oam oan oao oau ob- oba obb obe obf obm obn obo obu oea oeb oee oef oem oen oeo of- ofa ofb ofe off ofm ofn ofo ofu om- oma omb ome omf omm omn omo omu on- ona onb one onf onn ono onu oo- ooa oob oof oom oon ooo ou- oua oue ouf oum oun ouo ua- uaa uab uae uaf uam uan uao uau uba ubb ube ubf ubn ubo ubu uea ueb uee uef uem uen ufa ufe uff ufm ufn ufo ufu um- uma umb ume umf umm umn umo umu un- una unb une unf unm unn uno unu uoa uob uoe uom uon uoo uua uue uum uun uuu