-er a-a a-b a-i aaa aab aae aag aai aan aar aas ab- aba abb abe abg abi abn abr abs aea aeb aee aeg aei aen aer aes ag- aga agb age agg agi agn agr ags ai- aia aib aie aig aii ain air ais an- ana anb ane ang ani ann anr ans ar- ara arb are arg ari arn arr ars as- asa asb ase asg asi asn asr ass baa bab bae bag bai ban bar bas bba bbb bbe bbg bbi bbn bbr bbs be- bea beb bee beg bei ben ber bes bga bgb bge bgg bgi bgn bgr bgs bi- bia bib bie big bii bin bir bis bna bnb bne bng bni bnn bnr bns bra brb bre brg bri brn brr brs bsa bsb bse bsg bsi bsn bsr bss eaa eab eae eag eai ean ear eas eba ebb ebe ebg ebi ebn ebr ebs eea eeb eee eeg een eer ees ega egb ege egg egi egn egr egs eia eib eie eig eii ein eir eis en- ena enb ene eng eni enn enr ens era erb ere erg eri ern err ers es- esa esb ese esg esi esn esr ess gaa gab gae gag gai gan gar gas gba gbe gbg gbi gbn gbr gbs ge- gea geb gee geg gei gen ger ges gga ggb ggg ggi ggn ggr ggs gia gib gie gig gii gin gir gis gna gnb gne gni gnn gnr gns gra grb gre grg gri grn grr grs gsa gsb gse gsg gsi gsn gsr gss ia- iaa iab iae iag iai ian iar ias iba ibb ibe ibg ibi ibn ibr ibs ie- iea iee ieg iei ien ier ies iga igb ige igg igi ign igr igs iia iib iie iii iin iir iis in- ina inb ine ing ini inn inr ins ir- ira irb ire irg iri irn irr irs is- isa isb ise isg isi isn isr iss n-i naa nab nae nag nai nan nar nas nba nbb nbe nbg nbi nbn nbr nbs ne- nea neb nee neg nei nen ner nes nga ngb nge ngg ngi ngn ngs nia nib nie nig nii nin nir nis nna nnb nne nng nni nnn nns nra nrb nre nrg nri nrn nrr nrs nsa nsb nse nsg nsi nsn nsr nss ra- raa rab rae rag rai ran rar ras rba rbb rbe rbg rbi rbn rbr rbs re- rea reb ree reg rei ren rer res rga rgb rge rgg rgi rgn rgr rgs ria rib rie rig rii rin rir ris rna rnb rng rni rnn rnr rns rra rrb rrg rri rrn rrr rrs rsa rsb rse rsg rsi rsn rsr rss saa sab sae sag sai san sar sas sba sbb sbe sbg sbi sbn sbr sbs se- sea seb see seg sei sen ser ses sga sgb sge sgg sgi sgn sgr sgs sia sib sie sig sii sin sir sis sna snb sne sng sni snn snr sns sr- sra srb sre srg sri srn srr srs ss- ssa ssb sse ssg ssi ssn ssr sss