-er a-a a-b aaa aab aae aag aan aao aar aau aav ab- aba abb abe abg abn abo abr abu abv aea aeb aee aeg aen aeo aer aeu aev ag- aga agb age agg agn ago agr agu agv an- ana anb ane ang ann ano anr anu anv aoa aob aoe aog aon aoo aor aou aov ar- ara arb are arg arn aro arr aru arv au- aua aub aue aug aun auo aur auv av- ava avb ave avg avn avo avr avu b-u baa bab bae bag ban bao bar bau bav bba bbb bbe bbg bbn bbo bbr bbu be- bea beb bee beg ben beo ber beu bev bga bgb bge bgg bgn bgo bgr bgu bgv bna bnb bne bng bnn bno bnr bnu bnv boa bob boe bog bon boo bor bou bov bra brb bre brg brn bro brr bru brv bua bub bue bug bun buo bur buu bva bvb bve bvg bvn bvo bvr bvu bvv eaa eab eae eag ean eao ear eau eav eba ebb ebe ebg ebn ebo ebr ebu ebv eea eeb eee eeg een eeo eer eev ega egb ege egg egn ego egr egu en- ena enb ene eng enn eno enr enu env eo- eoa eob eoe eog eon eoo eor eou era erb ere erg ern ero err eru erv eu- eua eub eue eug eun eur euv eva evb eve evg evn evo evr evv gaa gab gae gag gan gao gar gau gav gba gbe gbg gbn gbo gbr gbu gbv ge- gea geb gee geg gen geo ger geu gev gga ggb ggg ggn ggo ggr ggu ggv gna gnb gne gnn gno gnr gnu gnv goa gob goe gog gon goo gor gou gov gra grb gre grg grn gro grr gru grv gu- gua gub gue gug gun guo gur guu guv gva gvb gve gvg gvn gvo gvr gvu naa nab nae nag nan nao nar nau nav nba nbb nbe nbg nbn nbo nbr nbu nbv ne- nea neb nee neg nen neo ner neu nev nga ngb nge ngg ngn ngo ngu nna nnb nne nng nnn nno nnu nnv no- noa nob noe nog non noo nor nou nov nra nrb nre nrg nrn nro nrr nru nrv nua nub nue nug nun nuo nur nuu nuv nva nvb nve nvg nvn nvu nvv oaa oab oae oag oan oao oar oau oav ob- oba obb obe obg obn obo obr obu obv 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 oov or- ora orb ore org orn oro orr oru orv ou- oua oue oun ouo our ov- ova ovb ove ovo ovv ra- raa rab rae rag ran rao rar rau rav rba rbb rbe rbg rbn rbo rbr rbu re- rea reb ree reg ren reo rer reu rev rga rgb rge rgg rgn rgo rgr rgv rna rnb rng rnn rno rnr rnu rnv roa rob roe rog ron roo ror rou rov rra rrb rrg rrn rrr rru rua rub rue rug run ruo rur ruu ruv rva rvb rve rvg rvn rvo rvr rvu rvv ua- uaa uab uae uag uan uao uar uau uav uba ubb ube ubg ubn ubo ubr ubu ubv uea ueb uee ueg uen uer uga ugb uge ugg ugn ugo ugr ugu un- una unb une ung unn uno unr unu unv uoa uob uoe uog uon uoo uor ur- ura urb ure urg urn uro urr uru uua uue uug uun uur uuu uva uvb uve uvo uvu uvv v-a v-e vaa vab vae vag van vao var vau vav vba vbg vbo vbr vbv vea veb vee veg ven veo ver veu vga vgg vgn vgo vgr vgu vn- vna vng vno vnr vnu vnv voa vob voe vog von voo vor vou vov vra vrb vre vrg vrn vrr vru vue vug vur vuv vva vvb vvg vvo vvr vvv