-er a-a a-b aaa aab aae aag aao aar aas aau ab- aba abb abe abg abo abr abs abu aea aeb aee aeg aeo aer aes aeu ag- aga agb age agg ago agr ags agu aoa aob aoe aog aoo aor aos aou ar- ara arb are arg aro arr ars aru as- asa asb ase asg aso asr ass asu au- aua aub aue aug auo aur aus b-u baa bab bae bag bao bar bas bau bba bbb bbe bbg bbo bbr bbs bbu be- bea beb bee beg beo ber bes beu bga bgb bge bgg bgo bgr bgs bgu boa bob boe bog boo bor bos bou bra brb bre brg bro brr brs bru bsa bsb bse bsg bso bsr bss bsu bua bub bue bug buo bur bus buu eaa eab eae eag eao ear eas eau eba ebb ebe ebg ebo ebr ebs ebu eea eeb eee eeg eeo eer ees ega egb ege egg ego egr egs egu eo- eoa eob eoe eog eoo eor eos eou era erb ere erg ero err ers eru es- esa esb ese esg eso esr ess esu eu- eua eub eue eug eur eus gaa gab gae gag gao gar gas gau gba gbe gbg gbo gbr gbs gbu ge- gea geb gee geg geo ger ges geu gga ggb ggg ggo ggr ggs ggu goa gob goe gog goo gor gos gou gra grb gre grg gro grr grs gru gsa gsb gse gsg gso gsr gss gsu gu- gua gub gue gug guo gur gus guu oaa oab oae oag oao oar oas oau ob- oba obb obe obg obo obr obs obu oea oeb oee oeg oeo oer oes oga oge ogg ogo ogs oo- ooa oob oog ooo oor oos or- ora orb ore org oro orr ors oru os- osa osb ose osg oso osr oss osu ou- oua oue ouo our ous ra- raa rab rae rag rao rar ras rau rba rbb rbe rbg rbo rbr rbs rbu re- rea reb ree reg reo rer res reu rga rgb rge rgg rgo rgr rgs roa rob roe rog roo ror ros rou rra rrb rrg rrr rrs rru rsa rsb rse rsg rso rsr rss rsu rua rub rue rug ruo rur rus ruu saa sab sae sag sao sar sas sau sba sbb sbe sbg sbo sbr sbs sbu se- sea seb see seg seo ser ses seu sga sgb sge sgg sgo sgr sgs sgu soa sob soe sog soo sor sos sou sr- sra srb sre srg sro srr srs ss- ssa ssb sse ssg sso ssr sss ssu sua sub sue sug suo sur sus suu ua- uaa uab uae uag uao uar uas uau uba ubb ube ubg ubo ubr ubs ubu uea ueb uee ueg uer ues uga ugb uge ugg ugo ugr ugs ugu uoa uob uoe uog uoo uor uos ur- ura urb ure urg uro urr urs uru usa usb use usg uso usr uss usu uua uue uug uur uus uuu