-er a-a a-b aaa aab aae aag aan aao aar aau ab- aba abb abe abg abn abo abr abu aea aeb aee aeg aen aeo aer aeu ag- aga agb age agg agn ago agr agu an- ana anb ane ang ann ano anr anu aoa aob aoe aog aon aoo aor aou ar- ara arb are arg arn aro arr aru au- aua aub aue aug aun auo aur b-u baa bab bae bag ban bao bar bau bba bbb bbe bbg bbn bbo bbr bbu be- bea beb bee beg ben beo ber beu bga bgb bge bgg bgn bgo bgr bgu bna bnb bne bng bnn bno bnr bnu boa bob boe bog bon boo bor bou bra brb bre brg brn bro brr bru bua bub bue bug bun buo bur buu eaa eab eae eag ean eao ear eau eba ebb ebe ebg ebn ebo ebr ebu eea eeb eee eeg een eeo eer ega egb ege egg egn ego egr egu en- ena enb ene eng enn eno enr enu eo- eoa eob eoe eog eon eoo eor eou era erb ere erg ern ero err eru eu- eua eub eue eug eun eur gaa gab gae gag gan gao gar gau gba gbe gbg gbn gbo gbr gbu ge- gea geb gee geg gen geo ger geu gga ggb ggg ggn ggo ggr ggu gna gnb gne gnn gno gnr gnu goa gob goe gog gon goo gor gou gra grb gre grg grn gro grr gru gu- gua gub gue gug gun guo gur guu naa nab nae nag nan nao nar nau nba nbb nbe nbg nbn nbo nbr nbu ne- nea neb nee neg nen neo ner neu nga ngb nge ngg ngn ngo ngu nna nnb nne nng nnn nno nnu no- noa nob noe nog non noo nor nou nra nrb nre nrg nrn nro nrr nru nua nub nue nug nun nuo nur nuu oaa oab oae oag oan oao oar oau ob- oba obb obe obg obn obo obr obu oea oeb oee oeg oen oeo oer oga oge ogg ogn ogo on- ona onb one ong onn ono onr onu oo- ooa oob oog oon ooo oor or- ora orb ore org orn oro orr oru ou- oua oue oun ouo our ra- raa rab rae rag ran rao rar rau rba rbb rbe rbg rbn rbo rbr rbu re- rea reb ree reg ren reo rer reu rga rgb rge rgg rgn rgo rgr rna rnb rng rnn rno rnr rnu roa rob roe rog ron roo ror rou rra rrb rrg rrn rrr rru rua rub rue rug run ruo rur ruu ua- uaa uab uae uag uan uao uar uau uba ubb ube ubg ubn ubo ubr ubu uea ueb uee ueg uen uer uga ugb uge ugg ugn ugo ugr ugu un- una unb une ung unn uno unr unu uoa uob uoe uog uon uoo uor ur- ura urb ure urg urn uro urr uru uua uue uug uun uur uuu