-er a-a a-b a-t aaa aab aae aan aar aat aau aav ab- aba abb abe abn abr abt abu abv aea aeb aee aen aer aet aeu aev an- ana anb ane ann anr ant anu anv ar- ara arb are arn arr art aru arv at- ata atb ate atn atr att atu atv au- aua aub aue aun aur aut auv av- ava avb ave avn avr avt avu b-u baa bab bae ban bar bat bau bav bba bbb bbe bbn bbr bbt bbu be- bea beb bee ben ber bet beu bev bna bnb bne bnn bnr bnt bnu bnv bra brb bre brn brr brt bru brv bta btb bte btn btr btt btu btv bua bub bue bun bur but buu bva bvb bve bvn bvr bvt bvu bvv eaa eab eae ean ear eat eau eav eba ebb ebe ebn ebr ebt ebu ebv eea eeb eee een eer eet eev en- ena enb ene enn enr ent enu env era erb ere ern err ert eru erv eta etb ete etn etr ett etu etv eu- eua eub eue eun eur eut euv eva evb eve evn evr evt evv naa nab nae nan nar nat nau nav nba nbb nbe nbn nbr nbt nbu nbv ne- nea neb nee nen ner net neu nev nna nnb nne nnn nnt nnu nnv nra nrb nre nrn nrr nrt nru nrv nta ntb nte ntn ntr ntt ntu ntv nua nub nue nun nur nut nuu nuv nva nvb nve nvn nvt nvu nvv ra- raa rab rae ran rar rat rau rav rba rbb rbe rbn rbr rbt rbu re- rea reb ree ren rer ret reu rev rna rnb rnn rnr rnt rnu rnv rra rrb rrn rrr rrt rru rta rtb rte rtn rtr rtt rtu rtv rua rub rue run rur rut ruu ruv rva rvb rve rvn rvr rvt rvu rvv taa tab tae tan tar tat tau tav tba tbb tbe tbn tbr tbt tbu tbv te- tea teb tee ten ter tet teu tev tna tnb tne tnn tnr tnt tra trb tre trn trr trt tru trv tta ttb tte ttn ttr ttt ttu ttv tua tub tue tun tur tut tuu tuv tva tvb tve tvn tvr tvt tvu ua- uaa uab uae uan uar uat uau uav uba ubb ube ubn ubr ubt ubu ubv uea ueb uee uen uer uet un- una unb une unn unr unt unu unv ur- ura urb ure urn urr urt uru uta utb ute utn utr utt utu utv uua uue uun uur uut uuu uva uvb uve uvu uvv v-a v-e vaa vab vae van var vat vau vav vba vbr vbv vea veb vee ven ver vet veu vn- vna vnr vnu vnv vra vrb vre vrn vrr vrt vru vta vtb vte vtr vtt vtu vtv vue vur vut vuv vva vvb vvr vvt vvv