-er a-a a-b aaa aab aae aaf aak aan aao aar aau ab- aba abb abe abf abk abn abo abr abu aea aeb aee aef aek aen aeo aer aeu af- afa afb afe aff afk afn afo afr afu aka akb ake akk akn ako akr aku an- ana anb ane anf ank ann ano anr anu aoa aob aoe aof aok aon aoo aor aou ar- ara arb are arf ark arn aro arr aru au- aua aub aue auf auk aun auo aur b-u baa bab bae baf bak ban bao bar bau bba bbb bbe bbf bbk bbn bbo bbr bbu be- bea beb bee bef bek ben beo ber beu bfa bfb bfe bff bfn bfo bfr bfu bka bkb bke bkf bkk bkn bko bkr bna bnb bne bnf bnk bnn bno bnr bnu boa bob boe bof bok bon boo bor bou bra brb bre brf brk brn bro brr bru bua bub bue buf buk bun buo bur buu eaa eab eae eaf eak ean eao ear eau eba ebb ebe ebf ebk ebn ebo ebr ebu eea eeb eee eef eek een eeo eer ef- efa efb efe eff efo efr eka ekb eke ekf eko ekr eku en- ena enb ene enf enk enn eno enr enu eo- eoa eob eoe eof eok eon eoo eor eou era erb ere erf erk ern ero err eru eu- eua eub eue euf eun eur faa fab fae faf fak fan fao far fau fba fbb fbe fbf fbk fbn fbo fbr fbu fea feb fee fef fek fen feo fer feu ffa ffe fff ffk ffn ffo ffr ffu fka fkb fkf fkk fna fnb fne fnf fnk fnn fnr fnu foa fob foe fof fok fon foo for fou fra frb fre frf frk frn fro frr fru fua fub fue fuf fuk fun fuo fur fuu ka- kaa kab kae kaf kak kan kao kar kau kba kbb kbe kbf kbk kbn kbo kbr kbu ke- kea keb kee kef kek ken keo ker kfa kff kfo kfu kkb kke kkk kkn kkr kku kn- kna kne knf knk knn kno knr knu koa kob koe kof kok kon koo kor kou kra krf krk krn kro krr kru kub kue kuk kun kur kuu naa nab nae naf nak nan nao nar nau nba nbb nbe nbf nbk nbn nbo nbr nbu ne- nea neb nee nef nek nen neo ner neu nfa nfb nfe nff nfk nfn nfo nfr nfu nka nke nkf nkk nkn nko nkr nku nna nnb nne nnf nnk nnn nno nnu no- noa nob noe nof nok non noo nor nou nra nrb nre nrf nrk nrn nro nrr nru nua nub nue nuk nun nuo nur nuu oaa oab oae oaf oak oan oao oar oau ob- oba obb obe obf obk obn obo obr obu oea oeb oee oef oen oeo oer of- ofa ofb ofe off ofn ofo ofr ofu oka okb oke okk oko okr oku on- ona onb one onf onk onn ono onr onu oo- ooa oob oof ook oon ooo oor or- ora orb ore orf ork orn oro orr oru ou- oua oue ouf ouk oun ouo our ra- raa rab rae raf rak ran rao rar rau rba rbb rbe rbf rbk rbn rbo rbr rbu re- rea reb ree ref rek ren reo rer reu rfa rfb rfe rff rfk rfn rfo rfr rfu rkb rke rkf rkk rko rku rna rnb rnn rno rnr rnu roa rob roe rof rok ron roo ror rou rra rrb rrf rrk rrn rrr rru rua rub rue ruf ruk run ruo rur ruu ua- uaa uab uae uaf uak uan uao uar uau uba ubb ube ubf ubk ubn ubo ubr ubu uea ueb uee uef uen uer ufa ufe uff ufn ufo ufr ufu uka ukb uke ukf ukk ukn ukr uku un- una unb une unf unk unn uno unr unu uoa uob uoe uok uon uoo uor ur- ura urb ure urf urk urn uro urr uru uua uue uun uur uuu