-er a-a a-b aaa aab aae aag aah aak aar aas ab- aba abb abe abg abh abk abr abs aea aeb aee aeg aeh aek aer aes ag- aga agb age agg agh agk agr ags aha ahb ahe ahg ahh ahk ahr ahs aka akb ake akg akh akk akr aks ar- ara arb are arg arh ark arr ars as- asa asb ase asg ash ask asr ass baa bab bae bag bah bak bar bas bba bbb bbe bbg bbh bbk bbr bbs be- bea beb bee beg beh bek ber bes bga bgb bge bgg bgh bgk bgr bgs bha bhb bhe bhg bhh bhk bhr bhs bka bkb bke bkg bkk bkr bks bra brb bre brg brh brk brr brs bsa bsb bse bsg bsh bsk bsr bss eaa eab eae eag eah eak ear eas eba ebb ebe ebg ebh ebk ebr ebs eea eeb eee eeg eek eer ees ega egb ege egg egh egr egs eha ehb ehe ehg ehh ehr ehs eka ekb eke ekg ekh ekr eks era erb ere erg erh erk err ers es- esa esb ese esg esh esk esr ess gaa gab gae gag gah gak gar gas gba gbe gbg gbh gbk gbr gbs ge- gea geb gee geg geh gek ger ges gga ggb ggg ggh ggr ggs gha ghb ghe ghg ghh ghr ghs gka gkb gkh gks gra grb gre grg grh grk grr grs gsa gsb gse gsg gsk gsr gss haa hab hae hag hah hak har has hba hbb hbe hbg hbh hbk hbr hbs he- hea heb hee heg heh hek her hes hga hgb hge hgg hgh hgk hgr hgs hha hhb hhe hhg hhh hhk hhr hhs hka hkb hkg hkh hkk hkr hks hr- hra hrb hre hrg hrh hrk hrr hrs hsa hsb hse hsg hsh hsk hsr hss ka- kaa kab kae kag kah kak kar kas kba kbb kbe kbh kbk kbr kbs ke- kea keb kee keg keh kek ker kes kga kgb kgh kgs kha khe khh khk khr khs kkb kke kkh kkk kkr kks kra krg krk krr krs ksa ksb kse ksg ksh ksk ksr kss ra- raa rab rae rag rah rak rar ras rba rbb rbe rbg rbh rbk rbr rbs re- rea reb ree reg reh rek rer res rga rgb rge rgg rgh rgk rgr rgs rh- rha rhb rhe rhg rhh rhr rhs rkb rke rkg rkk rks rra rrb rrg rrh rrk rrr rrs rsa rsb rse rsg rsh rsk rsr rss saa sab sae sag sah sak sar sas sba sbb sbe sbg sbh sbk sbr sbs se- sea seb see seg seh sek ser ses sga sgb sge sgg sgh sgk sgr sgs sh- sha shb she shg shh shk shr shs sk- ska skb ske skg skh skk skr sks sr- sra srb sre srg srh srk srr srs ss- ssa ssb sse ssg ssh ssk ssr sss