-er a-a a-b aaa aab aae aaf aag aao aar aau aav ab- aba abb abe abf abg abo abr abu abv aea aeb aee aef aeg aeo aer aeu aev af- afa afb afe aff afg afo afr afu afv ag- aga agb age agf agg ago agr agu agv aoa aob aoe aof aog aoo aor aou aov ar- ara arb are arf arg aro arr aru arv au- aua aub aue auf aug auo aur auv av- ava avb ave avf avg avo avr avu b-u baa bab bae baf bag bao bar bau bav bba bbb bbe bbf bbg bbo bbr bbu be- bea beb bee bef beg beo ber beu bev bfa bfb bfe bff bfg bfo bfr bfu bfv bga bgb bge bgf bgg bgo bgr bgu bgv boa bob boe bof bog boo bor bou bov bra brb bre brf brg bro brr bru brv bua bub bue buf bug buo bur buu bva bvb bve bvg bvo bvr bvu bvv eaa eab eae eaf eag eao ear eau eav eba ebb ebe ebf ebg ebo ebr ebu ebv eea eeb eee eef eeg eeo eer eev ef- efa efb efe eff efg efo efr ega egb ege egf egg ego egr egu eo- eoa eob eoe eof eog eoo eor eou era erb ere erf erg ero err eru erv eu- eua eub eue euf eug eur euv eva evb eve evf evg evo evr evv faa fab fae faf fag fao far fau fav fba fbb fbe fbf fbg fbo fbr fbu fea feb fee fef feg feo fer feu fev ffa ffe fff ffg ffo ffr ffu ffv fga fgb fge fgf fgg fgr fgv foa fob foe fof fog foo for fou fra frb fre frf frg fro frr fru fua fub fue fuf fug fuo fur fuu fuv fva fvg gaa gab gae gaf gag gao gar gau gav gba gbe gbf gbg gbo gbr gbu gbv ge- gea geb gee gef geg geo ger geu gev gfa gfb gfe gff gfo gfr gga ggb ggg ggo ggr ggu ggv goa gob goe gof gog goo gor gou gov gra grb gre grf grg gro grr gru grv gu- gua gub gue guf gug guo gur guu guv gva gvb gve gvf gvg gvo gvr gvu oaa oab oae oaf oag oao oar oau oav ob- oba obb obe obf obg obo obr obu obv oea oeb oee oef oeg oeo oer of- ofa ofb ofe off ofg ofo ofr ofu ofv oga oge ogf ogg ogo oo- ooa oob oof oog ooo oor oov or- ora orb ore orf org oro orr oru orv ou- oua oue ouf ouo our ov- ova ovb ove ovf ovo ovv ra- raa rab rae raf rag rao rar rau rav rba rbb rbe rbf rbg rbo rbr rbu re- rea reb ree ref reg reo rer reu rev rfa rfb rfe rff rfg rfo rfr rfu rfv rga rgb rge rgf rgg rgo rgr rgv roa rob roe rof rog roo ror rou rov rra rrb rrf rrg rrr rru rua rub rue ruf rug ruo rur ruu ruv rva rvb rve rvf rvg rvo rvr rvu rvv ua- uaa uab uae uaf uag uao uar uau uav uba ubb ube ubf ubg ubo ubr ubu ubv uea ueb uee uef ueg uer ufa ufe uff ufg ufo ufr ufu ufv uga ugb uge ugf ugg ugo ugr ugu uoa uob uoe uog uoo uor ur- ura urb ure urf urg uro urr uru uua uue uug uur uuu uva uvb uve uvf uvo uvu uvv v-a v-e vaa vab vae vag vao var vau vav vba vbg vbo vbr vbv vea veb vee vef veg veo ver veu vfa vfb vff vfg vfr vfu vfv vga vgf vgg vgo vgr vgu voa vob voe vof vog voo vor vou vov vra vrb vre vrf vrg vrr vru vue vug vur vuv vva vvb vvg vvo vvr vvv