-er a-a a-b a-t aaa aab aae aao aar aat aau aav ab- aba abb abe abo abr abt abu abv aea aeb aee aeo aer aet aeu aev aoa aob aoe aoo aor aot aou aov ar- ara arb are aro arr art aru arv at- ata atb ate ato atr att atu atv au- aua aub aue auo aur aut auv av- ava avb ave avo avr avt avu b-u baa bab bae bao bar bat bau bav bba bbb bbe bbo bbr bbt bbu be- bea beb bee beo ber bet beu bev boa bob boe boo bor bot bou bov bra brb bre bro brr brt bru brv bta btb bte bto btr btt btu btv bua bub bue buo bur but buu bva bvb bve bvo bvr bvt bvu bvv eaa eab eae eao ear eat eau eav eba ebb ebe ebo ebr ebt ebu ebv eea eeb eee eeo eer eet eev eo- eoa eob eoe eoo eor eot eou era erb ere ero err ert eru erv eta etb ete eto etr ett etu etv eu- eua eub eue eur eut euv eva evb eve evo evr evt evv oaa oab oae oao oar oat oau oav ob- oba obb obe obo obr obt obu obv oea oeb oee oeo oer oet oo- ooa oob ooo oor oot oov or- ora orb ore oro orr ort oru orv ot- ota otb ote oto otr ott otu otv ou- oua oue ouo our out ov- ova ovb ove ovo ovv ra- raa rab rae rao rar rat rau rav rba rbb rbe rbo rbr rbt rbu re- rea reb ree reo rer ret reu rev roa rob roe roo ror rot rou rov rra rrb rrr rrt rru rta rtb rte rto rtr rtt rtu rtv rua rub rue ruo rur rut ruu ruv rva rvb rve rvo rvr rvt rvu rvv taa tab tae tao tar tat tau tav tba tbb tbe tbo tbr tbt tbu tbv te- tea teb tee teo ter tet teu tev to- toa tob toe too tor tot tou tov tra trb tre tro trr trt tru trv tta ttb tte tto ttr ttt ttu ttv tua tub tue tuo tur tut tuu tuv tva tvb tve tvo tvr tvt tvu ua- uaa uab uae uao uar uat uau uav uba ubb ube ubo ubr ubt ubu ubv uea ueb uee uer uet uoa uob uoe uoo uor uot ur- ura urb ure uro urr urt uru uta utb ute uto utr utt utu utv uua uue uur uut uuu uva uvb uve uvo uvu uvv v-a v-e vaa vab vae vao var vat vau vav vba vbo vbr vbv vea veb vee veo ver vet veu voa vob voe voo vor vot vou vov vra vrb vre vrr vrt vru vta vtb vte vto vtr vtt vtu vtv vue vur vut vuv vva vvb vvo vvr vvt vvv