-er a-a a-b a-c aaa aab aac aae aag aah aak aar aas ab- aba abb abc abe abg abh abk abr abs ac- aca acb acc ace acg ach ack acr acs aea aeb aec aee aeg aeh aek aer aes ag- aga agb agc age agg agh agk agr ags aha ahb ahc ahe ahg ahh ahk ahr ahs aka akb akc ake akg akh akk akr aks ar- ara arb arc are arg arh ark arr ars as- asa asb asc ase asg ash ask asr ass baa bab bac bae bag bah bak bar bas bba bbb bbc bbe bbg bbh bbk bbr bbs bca bcb bcc bce bcg bch bck bcr bcs be- bea beb bec bee beg beh bek ber bes bga bgb bgc bge bgg bgh bgk bgr bgs bha bhb bhc bhe bhg bhh bhk bhr bhs bka bkb bkc bke bkg bkk bkr bks bra brb bre brg brh brk brr brs bsa bsb bsc bse bsg bsh bsk bsr bss c-- caa cab cac cae cag cah cak car cas cba cbb cbc cbe cbg cbh cbk cbr cbs cca ccb ccc cce ccg cch cck ccr ccs ce- cea ceb cec cee ceg ceh cek cer ces cga cgb cgc cge cgg cgh cgr cgs ch- cha chb chc che chg chh chk chr chs cka ckb ckc ckh cks cra crb crc cre crg crh crk crr crs csa csb csc cse csg csh csk csr css eaa eab eac eae eag eah eak ear eas eba ebb ebc ebe ebg ebh ebk ebr ebs ec- eca ecb ecc ece ecg ech eck ecr ecs eea eeb eec eee eeg eek eer ees ega egb egc ege egg egh egr egs eha ehb ehc ehe ehg ehh ehr ehs eka ekb ekc eke ekg ekh ekr eks era erb erc ere erg erh erk err ers es- esa esb esc ese esg esh esk esr ess gaa gab gac gae gag gah gak gar gas gba gbc gbe gbg gbh gbk gbr gbs gca gcb gcc gce gcg gch gck gcr gcs ge- gea geb gec gee geg geh gek ger ges gga ggb ggc ggg ggh ggr ggs gha ghb ghc ghe ghg ghh ghr ghs gka gkb gkh gks gra grb grc gre grg grh grk grr grs gsa gsb gsc gse gsg gsk gsr gss haa hab hac hae hag hah hak har has hba hbb hbc hbe hbg hbh hbk hbr hbs hca hcb hcc hce hcg hch hck hcr hcs he- hea heb hec hee heg heh hek her hes hga hgb hgc hge hgg hgh hgk hgr hgs hha hhb hhc hhe hhg hhh hhk hhr hhs hka hkb hkg hkh hkk hkr hks hr- hra hrb hrc hre hrg hrh hrk hrr hrs hsa hsb hsc hse hsg hsh hsk hsr hss ka- kaa kab kac kae kag kah kak kar kas kba kbb kbc kbe kbh kbk kbr kbs kca kcb kcc kce kcg kch kck kcr kcs ke- kea keb kec kee keg keh kek ker kes kga kgb kgc kgh kgs kha khe khh khk khr khs kkb kkc kke kkh kkk kkr kks kra krc krg krk krr krs ksa ksb ksc kse ksg ksh ksk ksr kss ra- raa rab rac rae rag rah rak rar ras rba rbb rbc rbe rbg rbh rbk rbr rbs rca rcb rcc rce rcg rch rcr rcs re- rea reb rec ree reg reh rek rer res rga rgb rgc rge rgg rgh rgk rgr rgs rh- rha rhb rhc rhe rhg rhh rhr rhs rkb rkc rke rkg rkk rks rra rrb rrc rrg rrh rrk rrr rrs rsa rsb rsc rse rsg rsh rsk rsr rss saa sab sac sae sag sah sak sar sas sba sbb sbc sbe sbg sbh sbk sbr sbs sca scb scc sce scg sch sck scr scs se- sea seb sec see seg seh sek ser ses sga sgb sgc sge sgg sgh sgk sgr sgs sh- sha shb shc she shg shh shk shr shs sk- ska skb skc ske skg skh skk skr sks sr- sra srb src sre srg srh srk srr srs ss- ssa ssb ssc sse ssg ssh ssk ssr sss