-er a-a a-b a-q aaa aab aae aag aaq aar aas ab- aba abb abe abg abq abr abs aea aeb aee aeg aeq aer aes ag- aga agb age agg agq agr ags aqa aqr aqs ar- ara arb are arg arq arr ars as- asa asb ase asg asq asr ass baa bab bae bag baq bar bas bba bbb bbe bbg bbq bbr bbs be- bea beb bee beg beq ber bes bga bgb bge bgg bgr bgs bqe bra brb bre brg brq brr brs bsa bsb bse bsg bsr bss eaa eab eae eag ear eas eba ebb ebe ebg ebq ebr ebs eea eeb eee eeg eer ees ega egb ege egg egr egs eqa eqe eqq eqs era erb ere erg erq err ers es- esa esb ese esg esq esr ess gaa gab gae gag gar gas gba gbe gbg gbr gbs ge- gea geb gee geg ger ges gga ggb ggg ggr ggs gqs gra grb gre grg grq grr grs gsa gsb gse gsg gsr gss qaa qag qar qas qba qbe qbq qbs qee qga qqq qra qrb qre qrg qrs qsa qsr ra- raa rab rae rag raq rar ras rba rbb rbe rbg rbr rbs re- rea reb ree reg req rer res rga rgb rge rgg rgr rgs rqs rra rrb rrg rrq rrr rrs rsa rsb rse rsg rsq rsr rss saa sab sae sag saq sar sas sba sbb sbe sbg sbq sbr sbs se- sea seb see seg seq ser ses sga sgb sge sgg sgr sgs sqa sqq sqr sqs sr- sra srb sre srg srq srr srs ss- ssa ssb sse ssg ssq ssr sss