-er a-a a-b aaa aab aae aag aan aar aau aav ab- aba abb abe abg abn abr abu abv aea aeb aee aeg aen aer aeu aev ag- aga agb age agg agn agr agu agv an- ana anb ane ang ann anr anu anv ar- ara arb are arg arn arr aru arv au- aua aub aue aug aun aur auv av- ava avb ave avg avn avr avu b-u baa bab bae bag ban bar bau bav bba bbb bbe bbg bbn bbr bbu be- bea beb bee beg ben ber beu bev bga bgb bge bgg bgn bgr bgu bgv bna bnb bne bng bnn bnr bnu bnv bra brb bre brg brn brr bru brv bua bub bue bug bun bur buu bva bvb bve bvg bvn bvr bvu bvv eaa eab eae eag ean ear eau eav eba ebb ebe ebg ebn ebr ebu ebv eea eeb eee eeg een eer eev ega egb ege egg egn egr egu en- ena enb ene eng enn enr enu env era erb ere erg ern err eru erv eu- eua eub eue eug eun eur euv eva evb eve evg evn evr evv gaa gab gae gag gan gar gau gav gba gbe gbg gbn gbr gbu gbv ge- gea geb gee geg gen ger geu gev gga ggb ggg ggn ggr ggu ggv gna gnb gne gnn gnr gnu gnv gra grb gre grg grn grr gru grv gu- gua gub gue gug gun gur guu guv gva gvb gve gvg gvn gvr gvu naa nab nae nag nan nar nau nav nba nbb nbe nbg nbn nbr nbu nbv ne- nea neb nee neg nen ner neu nev nga ngb nge ngg ngn ngu nna nnb nne nng nnn nnu nnv nra nrb nre nrg nrn nrr nru nrv nua nub nue nug nun nur nuu nuv nva nvb nve nvg nvn nvu nvv ra- raa rab rae rag ran rar rau rav rba rbb rbe rbg rbn rbr rbu re- rea reb ree reg ren rer reu rev rga rgb rge rgg rgn rgr rgv rna rnb rng rnn rnr rnu rnv rra rrb rrg rrn rrr rru rua rub rue rug run rur ruu ruv rva rvb rve rvg rvn rvr rvu rvv ua- uaa uab uae uag uan uar uau uav uba ubb ube ubg ubn ubr ubu ubv uea ueb uee ueg uen uer uga ugb uge ugg ugn ugr ugu un- una unb une ung unn unr unu unv ur- ura urb ure urg urn urr uru uua uue uug uun uur uuu uva uvb uve uvu uvv v-a v-e vaa vab vae vag van var vau vav vba vbg vbr vbv vea veb vee veg ven ver veu vga vgg vgn vgr vgu vn- vna vng vnr vnu vnv vra vrb vre vrg vrn vrr vru vue vug vur vuv vva vvb vvg vvr vvv