-er a-a a-b a-i aaa aab aae aag aai aak aam aar aas ab- aba abb abe abg abi abk abm abr abs aea aeb aee aeg aei aek aem aer aes ag- aga agb age agg agi agk agm agr ags ai- aia aib aie aig aii aik aim air ais aka akb ake akg aki akk akm akr aks ama amb ame amg ami amk amm amr ams ar- ara arb are arg ari ark arm arr ars as- asa asb ase asg asi ask asm asr ass baa bab bae bag bai bak bam bar bas bba bbb bbe bbg bbi bbk bbm bbr bbs be- bea beb bee beg bei bek bem ber bes bga bgb bge bgg bgi bgk bgm bgr bgs bi- bia bib bie big bii bik bim bir bis bka bkb bke bkg bkk bkm bkr bks bma bmb bme bmg bmi bmk bmm bmr bms bra brb bre brg bri brk brm brr brs bsa bsb bse bsg bsi bsk bsm bsr bss eaa eab eae eag eai eak eam ear eas eba ebb ebe ebg ebi ebk ebm ebr ebs eea eeb eee eeg eek eem eer ees ega egb ege egg egi egm egr egs eia eib eie eig eii eik eim eir eis eka ekb eke ekg eki ekr eks em- ema emb eme emg emi emk emm emr ems era erb ere erg eri erk erm err ers es- esa esb ese esg esi esk esm esr ess gaa gab gae gag gai gak gam gar gas gba gbe gbg gbi gbk gbm gbr gbs ge- gea geb gee geg gei gek gem ger ges gga ggb ggg ggi ggm ggr ggs gia gib gie gig gii gik gim gir gis gka gkb gkm gks gma gmb gme gmg gmi gmm gmr gms gra grb gre grg gri grk grm grr grs gsa gsb gse gsg gsi gsk gsm gsr gss ia- iaa iab iae iag iai iam iar ias iba ibb ibe ibg ibi ibk ibm ibr ibs ie- iea iee ieg iei iek iem ier ies iga igb ige igg igi igk igm igr igs iia iib iie iii iim iir iis ika ikb ike iki ikk ikr iks im- ima imb ime img imi imm ims ir- ira irb ire irg iri irk irm irr irs is- isa isb ise isg isi isk ism isr iss ka- kaa kab kae kag kai kak kam kar kas kba kbb kbe kbi kbk kbm kbr kbs ke- kea keb kee keg kei kek kem ker kes kga kgb kgi kgm kgs kia kib kie kig kii kik kim kir kis kkb kke kki kkk kkm kkr kks kma kmb kme kmg kmi kmk kmm kms kra krg kri krk krr krs ksa ksb kse ksg ksi ksk ksm ksr kss m-r maa mab mae mag mai mak mam mar mas mba mbb mbe mbg mbi mbk mbm mbr mbs mea meb mee meg mei mek mem mer mes mga mgb mge mgi mgk mgm mgr mgs mi- mia mib mie mig mii mik mim mir mis mka mkb mke mkg mkk mkm mkr mks mma mmb mme mmg mmi mmk mmm mmr mms mra mrb mre mrg mri mrk mrm mrr mrs msa msb mse msg msi msk msm msr mss ra- raa rab rae rag rai rak ram rar ras rba rbb rbe rbg rbi rbk rbm rbr rbs re- rea reb ree reg rei rek rem rer res rga rgb rge rgg rgi rgk rgr rgs ria rib rie rig rii rik rim rir ris rkb rke rkg rkk rkm rks rma rmb rme rmg rmi rmm rmr rms rra rrb rrg rri rrk rrm rrr rrs rsa rsb rse rsg rsi rsk rsm rsr rss saa sab sae sag sai sak sam sar sas sba sbb sbe sbg sbi sbk sbm sbr sbs se- sea seb see seg sei sek sem ser ses sga sgb sge sgg sgi sgk sgm sgr sgs sia sib sie sig sii sik sim sir sis sk- ska skb ske skg ski skk skm skr sks sma smb sme smg smi smk smm smr sms sr- sra srb sre srg sri srk srm srr srs ss- ssa ssb sse ssg ssi ssk ssm ssr sss