-er a-a a-b aaa aab aae aag aam aar aas ab- aba abb abe abg abm abr abs aea aeb aee aeg aem aer aes ag- aga agb age agg agm agr ags ama amb ame amg amm amr ams ar- ara arb are arg arm arr ars as- asa asb ase asg asm asr ass baa bab bae bag bam bar bas bba bbb bbe bbg bbm bbr bbs be- bea beb bee beg bem ber bes bga bgb bge bgg bgm bgr bgs bma bmb bme bmg bmm bmr bms bra brb bre brg brm brr brs bsa bsb bse bsg bsm bsr bss eaa eab eae eag eam ear eas eba ebb ebe ebg ebm ebr ebs eea eeb eee eeg eem eer ees ega egb ege egg egm egr egs em- ema emb eme emg emm emr ems era erb ere erg erm err ers es- esa esb ese esg esm esr ess gaa gab gae gag gam gar gas gba gbe gbg gbm gbr gbs ge- gea geb gee geg gem ger ges gga ggb ggg ggm ggr ggs gma gmb gme gmg gmm gmr gms gra grb gre grg grm grr grs gsa gsb gse gsg gsm gsr gss m-r maa mab mae mag mam mar mas mba mbb mbe mbg mbm mbr mbs mea meb mee meg mem mer mes mga mgb mge mgm mgr mgs mma mmb mme mmg mmm mmr mms mra mrb mre mrg mrm mrr mrs msa msb mse msg msm msr mss ra- raa rab rae rag ram rar ras rba rbb rbe rbg rbm rbr rbs re- rea reb ree reg rem rer res rga rgb rge rgg rgr rgs rma rmb rme rmg rmm rmr rms rra rrb rrg rrm rrr rrs rsa rsb rse rsg rsm rsr rss saa sab sae sag sam sar sas sba sbb sbe sbg sbm sbr sbs se- sea seb see seg sem ser ses sga sgb sge sgg sgm sgr sgs sma smb sme smg smm smr sms sr- sra srb sre srg srm srr srs ss- ssa ssb sse ssg ssm ssr sss