-er a-a a-b a-i aaa aab aae aag aai aam aan aar aas ab- aba abb abe abg abi abm abn abr abs aea aeb aee aeg aei aem aen aer aes ag- aga agb age agg agi agm agn agr ags ai- aia aib aie aig aii aim ain air ais ama amb ame amg ami amm amn amr ams an- ana anb ane ang ani anm ann anr ans ar- ara arb are arg ari arm arn arr ars as- asa asb ase asg asi asm asn asr ass baa bab bae bag bai bam ban bar bas bba bbb bbe bbg bbi bbm bbn bbr bbs be- bea beb bee beg bei bem ben ber bes bga bgb bge bgg bgi bgm bgn bgr bgs bi- bia bib bie big bii bim bin bir bis bma bmb bme bmg bmi bmm bmn bmr bms bna bnb bne bng bni bnn bnr bns bra brb bre brg bri brm brn brr brs bsa bsb bse bsg bsi bsm bsn bsr bss eaa eab eae eag eai eam ean ear eas eba ebb ebe ebg ebi ebm ebn ebr ebs eea eeb eee eeg eem een eer ees ega egb ege egg egi egm egn egr egs eia eib eie eig eii eim ein eir eis em- ema emb eme emg emi emm emn emr ems en- ena enb ene eng eni enm enn enr ens era erb ere erg eri erm ern err ers es- esa esb ese esg esi esm esn esr ess gaa gab gae gag gai gam gan gar gas gba gbe gbg gbi gbm gbn gbr gbs ge- gea geb gee geg gei gem gen ger ges gga ggb ggg ggi ggm ggn ggr ggs gia gib gie gig gii gim gin gir gis gma gmb gme gmg gmi gmm gmn gmr gms gna gnb gne gni gnm gnn gnr gns gra grb gre grg gri grm grn grr grs gsa gsb gse gsg gsi gsm gsn gsr gss ia- iaa iab iae iag iai iam ian iar ias iba ibb ibe ibg ibi ibm ibn ibr ibs ie- iea iee ieg iei iem ien ier ies iga igb ige igg igi igm ign igr igs iia iib iie iii iim iin iir iis im- ima imb ime img imi imm imn ims in- ina inb ine ing ini inm inn inr ins ir- ira irb ire irg iri irm irn irr irs is- isa isb ise isg isi ism isn isr iss m-r maa mab mae mag mai mam man mar mas mba mbb mbe mbg mbi mbm mbr mbs mea meb mee meg mei mem men mer mes mga mgb mge mgi mgm mgn mgr mgs mi- mia mib mie mig mii mim min mir mis mma mmb mme mmg mmi mmm mmn mmr mms mna mnb mne mng mni mnm mnn mnr mns mra mrb mre mrg mri mrm mrn mrr mrs msa msb mse msg msi msm msn msr mss n-i naa nab nae nag nai nam nan nar nas nba nbb nbe nbg nbi nbm nbn nbr nbs ne- nea neb nee neg nei nem nen ner nes nga ngb nge ngg ngi ngm ngn ngs nia nib nie nig nii nim nin nir nis nma nmb nme nmg nmi nmm nmn nmr nms nna nnb nne nng nni nnm nnn nns nra nrb nre nrg nri nrm nrn nrr nrs nsa nsb nse nsg nsi nsm nsn nsr nss ra- raa rab rae rag rai ram ran rar ras rba rbb rbe rbg rbi rbm rbn rbr rbs re- rea reb ree reg rei rem ren rer res rga rgb rge rgg rgi rgn rgr rgs ria rib rie rig rii rim rin rir ris rma rmb rme rmg rmi rmm rmn rmr rms rna rnb rng rni rnm rnn rnr rns rra rrb rrg rri rrm rrn rrr rrs rsa rsb rse rsg rsi rsm rsn rsr rss saa sab sae sag sai sam san sar sas sba sbb sbe sbg sbi sbm sbn sbr sbs se- sea seb see seg sei sem sen ser ses sga sgb sge sgg sgi sgm sgn sgr sgs sia sib sie sig sii sim sin sir sis sma smb sme smg smi smm smn smr sms sna snb sne sng sni snm snn snr sns sr- sra srb sre srg sri srm srn srr srs ss- ssa ssb sse ssg ssi ssm ssn ssr sss