-er a-a a-b a-i aaa aab aae aag aai aam aar aas ab- aba abb abe abg abi abm abr abs aea aeb aee aeg aei aem aer aes ag- aga agb age agg agi agm agr ags ai- aia aib aie aig aii aim air ais ama amb ame amg ami amm amr ams ar- ara arb are arg ari arm arr ars as- asa asb ase asg asi asm asr ass baa bab bae bag bai bam bar bas bba bbb bbe bbg bbi bbm bbr bbs be- bea beb bee beg bei bem ber bes bga bgb bge bgg bgi bgm bgr bgs bi- bia bib bie big bii bim bir bis bma bmb bme bmg bmi bmm bmr bms bra brb bre brg bri brm brr brs bsa bsb bse bsg bsi bsm bsr bss eaa eab eae eag eai eam ear eas eba ebb ebe ebg ebi ebm ebr ebs eea eeb eee eeg eem eer ees ega egb ege egg egi egm egr egs eia eib eie eig eii eim eir eis em- ema emb eme emg emi emm emr ems era erb ere erg eri erm err ers es- esa esb ese esg esi esm esr ess gaa gab gae gag gai gam gar gas gba gbe gbg gbi gbm gbr gbs ge- gea geb gee geg gei gem ger ges gga ggb ggg ggi ggm ggr ggs gia gib gie gig gii gim gir gis gma gmb gme gmg gmi gmm gmr gms gra grb gre grg gri grm grr grs gsa gsb gse gsg gsi gsm gsr gss ia- iaa iab iae iag iai iam iar ias iba ibb ibe ibg ibi ibm ibr ibs ie- iea iee ieg iei iem ier ies iga igb ige igg igi igm igr igs iia iib iie iii iim iir iis im- ima imb ime img imi imm ims ir- ira irb ire irg iri irm irr irs is- isa isb ise isg isi ism isr iss m-r maa mab mae mag mai mam mar mas mba mbb mbe mbg mbi mbm mbr mbs mea meb mee meg mei mem mer mes mga mgb mge mgi mgm mgr mgs mi- mia mib mie mig mii mim mir mis mma mmb mme mmg mmi mmm mmr mms mra mrb mre mrg mri mrm mrr mrs msa msb mse msg msi msm msr mss ra- raa rab rae rag rai ram rar ras rba rbb rbe rbg rbi rbm rbr rbs re- rea reb ree reg rei rem rer res rga rgb rge rgg rgi rgr rgs ria rib rie rig rii rim rir ris rma rmb rme rmg rmi rmm rmr rms rra rrb rrg rri rrm rrr rrs rsa rsb rse rsg rsi rsm rsr rss saa sab sae sag sai sam sar sas sba sbb sbe sbg sbi sbm sbr sbs se- sea seb see seg sei sem ser ses sga sgb sge sgg sgi sgm sgr sgs sia sib sie sig sii sim sir sis sma smb sme smg smi smm smr sms sr- sra srb sre srg sri srm srr srs ss- ssa ssb sse ssg ssi ssm ssr sss