-er a-a a-b a-c aaa aab aac aae aag aan aar aau aav ab- aba abb abc abe abg abn abr abu abv ac- aca acb acc ace acg acn acr acu acv aea aeb aec aee aeg aen aer aeu aev ag- aga agb agc age agg agn agr agu agv an- ana anb anc ane ang ann anr anu anv ar- ara arb arc are arg arn arr aru arv au- aua aub auc aue aug aun aur auv av- ava avb avc ave avg avn avr avu b-u baa bab bac bae bag ban bar bau bav bba bbb bbc bbe bbg bbn bbr bbu bca bcb bcc bce bcg bcn bcr bcu bcv be- bea beb bec bee beg ben ber beu bev bga bgb bgc bge bgg bgn bgr bgu bgv bna bnb bnc bne bng bnn bnr bnu bnv bra brb bre brg brn brr bru brv bua bub buc bue bug bun bur buu bva bvb bvc bve bvg bvn bvr bvu bvv c-- caa cab cac cae cag can car cau cav cba cbb cbc cbe cbg cbn cbr cbu cbv cca ccb ccc cce ccg ccn ccr ccu ccv ce- cea ceb cec cee ceg cen cer ceu cev cga cgb cgc cge cgg cgn cgr cgu cgv cn- cna cnb cnc cne cng cnn cnr cnu cnv cra crb crc cre crg crn crr cru crv cua cub cuc cue cug cun cur cuu cuv cva cvb cvc cve cvg cvn cvr cvu cvv eaa eab eac eae eag ean ear eau eav eba ebb ebc ebe ebg ebn ebr ebu ebv ec- eca ecb ecc ece ecg ecn ecr ecu ecv eea eeb eec eee eeg een eer eev ega egb egc ege egg egn egr egu en- ena enb enc ene eng enn enr enu env era erb erc ere erg ern err eru erv eu- eua eub euc eue eug eun eur euv eva evb evc eve evg evn evr evv gaa gab gac gae gag gan gar gau gav gba gbc gbe gbg gbn gbr gbu gbv gca gcb gcc gce gcg gcn gcr gcu ge- gea geb gec gee geg gen ger geu gev gga ggb ggc ggg ggn ggr ggu ggv gna gnb gnc gne gnn gnr gnu gnv gra grb grc gre grg grn grr gru grv gu- gua gub guc gue gug gun gur guu guv gva gvb gvc gve gvg gvn gvr gvu naa nab nac nae nag nan nar nau nav nba nbb nbc nbe nbg nbn nbr nbu nbv nca ncb ncc nce ncg ncn ncr ncu ncv ne- nea neb nec nee neg nen ner neu nev nga ngb ngc nge ngg ngn ngu nna nnb nnc nne nng nnn nnu nnv nra nrb nrc nre nrg nrn nrr nru nrv nua nub nuc nue nug nun nur nuu nuv nva nvb nvc nve nvg nvn nvu nvv ra- raa rab rac rae rag ran rar rau rav rba rbb rbc rbe rbg rbn rbr rbu rca rcb rcc rce rcg rcn rcr rcu rcv re- rea reb rec ree reg ren rer reu rev rga rgb rgc rge rgg rgn rgr rgv rna rnb rnc rng rnn rnr rnu rnv rra rrb rrc rrg rrn rrr rru rua rub ruc rue rug run rur ruu ruv rva rvb rvc rve rvg rvn rvr rvu rvv ua- uaa uab uac uae uag uan uar uau uav uba ubb ubc ube ubg ubn ubr ubu ubv uca ucb ucc uce ucg ucn ucr ucu ucv uea ueb uec uee ueg uen uer uga ugb ugc uge ugg ugn ugr ugu un- una unb unc une ung unn unr unu unv ur- ura urb urc ure urg urn urr uru uua uuc uue uug uun uur uuu uva uvb uvc uve uvu uvv v-a v-e vaa vab vac vae vag van var vau vav vba vbc vbg vbr vbv vca vcc vce vcn vcr vcu vea veb vec vee veg ven ver veu vga vgc vgg vgn vgr vgu vn- vna vng vnr vnu vnv vra vrb vrc vre vrg vrn vrr vru vue vug vur vuv vva vvb vvc vvg vvr vvv