-er a-a a-b aaa aab aae aaf aag aan aao aar aau ab- aba abb abe abf abg abn abo abr abu aea aeb aee aef aeg aen aeo aer aeu af- afa afb afe aff afg afn afo afr afu ag- aga agb age agf agg agn ago agr agu an- ana anb ane anf ang ann ano anr anu aoa aob aoe aof aog aon aoo aor aou ar- ara arb are arf arg arn aro arr aru au- aua aub aue auf aug aun auo aur b-u baa bab bae baf bag ban bao bar bau bba bbb bbe bbf bbg bbn bbo bbr bbu be- bea beb bee bef beg ben beo ber beu bfa bfb bfe bff bfg bfn bfo bfr bfu bga bgb bge bgf bgg bgn bgo bgr bgu bna bnb bne bnf bng bnn bno bnr bnu boa bob boe bof bog bon boo bor bou bra brb bre brf brg brn bro brr bru bua bub bue buf bug bun buo bur buu eaa eab eae eaf eag ean eao ear eau eba ebb ebe ebf ebg ebn ebo ebr ebu eea eeb eee eef eeg een eeo eer ef- efa efb efe eff efg efo efr ega egb ege egf egg egn ego egr egu en- ena enb ene enf eng enn eno enr enu eo- eoa eob eoe eof eog eon eoo eor eou era erb ere erf erg ern ero err eru eu- eua eub eue euf eug eun eur faa fab fae faf fag fan fao far fau fba fbb fbe fbf fbg fbn fbo fbr fbu fea feb fee fef feg fen feo fer feu ffa ffe fff ffg ffn ffo ffr ffu fga fgb fge fgf fgg fgn fgr fna fnb fne fnf fng fnn fnr fnu foa fob foe fof fog fon foo for fou fra frb fre frf frg frn fro frr fru fua fub fue fuf fug fun fuo fur fuu gaa gab gae gaf gag gan gao gar gau gba gbe gbf gbg gbn gbo gbr gbu ge- gea geb gee gef geg gen geo ger geu gfa gfb gfe gff gfo gfr gga ggb ggg ggn ggo ggr ggu gna gnb gne gnf gnn gno gnr gnu goa gob goe gof gog gon goo gor gou gra grb gre grf grg grn gro grr gru gu- gua gub gue guf gug gun guo gur guu naa nab nae naf nag nan nao nar nau nba nbb nbe nbf nbg nbn nbo nbr nbu ne- nea neb nee nef neg nen neo ner neu nfa nfb nfe nff nfn nfo nfr nfu nga ngb nge ngf ngg ngn ngo ngu nna nnb nne nnf nng nnn nno nnu no- noa nob noe nof nog non noo nor nou nra nrb nre nrf nrg nrn nro nrr nru nua nub nue nug nun nuo nur nuu oaa oab oae oaf oag oan oao oar oau ob- oba obb obe obf obg obn obo obr obu oea oeb oee oef oeg oen oeo oer of- ofa ofb ofe off ofg ofn ofo ofr ofu oga oge ogf ogg ogn ogo on- ona onb one onf ong onn ono onr onu oo- ooa oob oof oog oon ooo oor or- ora orb ore orf org orn oro orr oru ou- oua oue ouf oun ouo our ra- raa rab rae raf rag ran rao rar rau rba rbb rbe rbf rbg rbn rbo rbr rbu re- rea reb ree ref reg ren reo rer reu rfa rfb rfe rff rfg rfn rfo rfr rfu rga rgb rge rgf rgg rgn rgo rgr rna rnb rng rnn rno rnr rnu roa rob roe rof rog ron roo ror rou rra rrb rrf rrg rrn rrr rru rua rub rue ruf rug run ruo rur ruu ua- uaa uab uae uaf uag uan uao uar uau uba ubb ube ubf ubg ubn ubo ubr ubu uea ueb uee uef ueg uen uer ufa ufe uff ufg ufn ufo ufr ufu uga ugb uge ugf ugg ugn ugo ugr ugu un- una unb une unf ung unn uno unr unu uoa uob uoe uog uon uoo uor ur- ura urb ure urf urg urn uro urr uru uua uue uug uun uur uuu