-er a-a a-b a-t aaa aab aae aaf aao aar aat aau ab- aba abb abe abf abo abr abt abu aea aeb aee aef aeo aer aet aeu af- afa afb afe aff afo afr aft afu aoa aob aoe aof aoo aor aot aou ar- ara arb are arf aro arr art aru at- ata atb ate atf ato atr att atu au- aua aub aue auf auo aur aut b-u baa bab bae baf bao bar bat bau bba bbb bbe bbf bbo bbr bbt bbu be- bea beb bee bef beo ber bet beu bfa bfb bfe bff bfo bfr bft bfu boa bob boe bof boo bor bot bou bra brb bre brf bro brr brt bru bta btb bte btf bto btr btt btu bua bub bue buf buo bur but buu eaa eab eae eaf eao ear eat eau eba ebb ebe ebf ebo ebr ebt ebu eea eeb eee eef eeo eer eet ef- efa efb efe eff efo efr eft eo- eoa eob eoe eof eoo eor eot eou era erb ere erf ero err ert eru eta etb ete etf eto etr ett etu eu- eua eub eue euf eur eut faa fab fae faf fao far fat fau fba fbb fbe fbf fbo fbr fbt fbu fea feb fee fef feo fer fet feu ffa ffe fff ffo ffr fft ffu foa fob foe fof foo for fot fou fra frb fre frf fro frr frt fru fta ftb fte ftf fto ftr ftt ftu fua fub fue fuf fuo fur fut fuu oaa oab oae oaf oao oar oat oau ob- oba obb obe obf obo obr obt obu oea oeb oee oef oeo oer oet of- ofa ofb ofe off ofo ofr oft ofu oo- ooa oob oof ooo oor oot or- ora orb ore orf oro orr ort oru ot- ota otb ote otf oto otr ott otu ou- oua oue ouf ouo our out ra- raa rab rae raf rao rar rat rau rba rbb rbe rbf rbo rbr rbt rbu re- rea reb ree ref reo rer ret reu rfa rfb rfe rff rfo rfr rft rfu roa rob roe rof roo ror rot rou rra rrb rrf rrr rrt rru rta rtb rte rtf rto rtr rtt rtu rua rub rue ruf ruo rur rut ruu taa tab tae taf tao tar tat tau tba tbb tbe tbf tbo tbr tbt tbu te- tea teb tee tef teo ter tet teu tfa tfb tfe tff tfo tfr tft tfu to- toa tob toe tof too tor tot tou tra trb tre trf tro trr trt tru tta ttb tte ttf tto ttr ttt ttu tua tub tue tuf tuo tur tut tuu ua- uaa uab uae uaf uao uar uat uau uba ubb ube ubf ubo ubr ubt ubu uea ueb uee uef uer uet ufa ufe uff ufo ufr uft ufu uoa uob uoe uoo uor uot ur- ura urb ure urf uro urr urt uru uta utb ute utf uto utr utt utu uua uue uur uut uuu