-er a-a a-b a-c aaa aab aac aae aag aah aar aas ab- aba abb abc abe abg abh abr abs ac- aca acb acc ace acg ach acr acs aea aeb aec aee aeg aeh aer aes ag- aga agb agc age agg agh agr ags aha ahb ahc ahe ahg ahh ahr ahs ar- ara arb arc are arg arh arr ars as- asa asb asc ase asg ash asr ass baa bab bac bae bag bah bar bas bba bbb bbc bbe bbg bbh bbr bbs bca bcb bcc bce bcg bch bcr bcs be- bea beb bec bee beg beh ber bes bga bgb bgc bge bgg bgh bgr bgs bha bhb bhc bhe bhg bhh bhr bhs bra brb bre brg brh brr brs bsa bsb bsc bse bsg bsh bsr bss c-- caa cab cac cae cag cah car cas cba cbb cbc cbe cbg cbh cbr cbs cca ccb ccc cce ccg cch ccr ccs ce- cea ceb cec cee ceg ceh cer ces cga cgb cgc cge cgg cgh cgr cgs ch- cha chb chc che chg chh chr chs cra crb crc cre crg crh crr crs csa csb csc cse csg csh csr css eaa eab eac eae eag eah ear eas eba ebb ebc ebe ebg ebh ebr ebs ec- eca ecb ecc ece ecg ech ecr ecs eea eeb eec eee eeg eer ees ega egb egc ege egg egh egr egs eha ehb ehc ehe ehg ehh ehr ehs era erb erc ere erg erh err ers es- esa esb esc ese esg esh esr ess gaa gab gac gae gag gah gar gas gba gbc gbe gbg gbh gbr gbs gca gcb gcc gce gcg gch gcr gcs ge- gea geb gec gee geg geh ger ges gga ggb ggc ggg ggh ggr ggs gha ghb ghc ghe ghg ghh ghr ghs gra grb grc gre grg grh grr grs gsa gsb gsc gse gsg gsr gss haa hab hac hae hag hah har has hba hbb hbc hbe hbg hbh hbr hbs hca hcb hcc hce hcg hch hcr hcs he- hea heb hec hee heg heh her hes hga hgb hgc hge hgg hgh hgr hgs hha hhb hhc hhe hhg hhh hhr hhs hr- hra hrb hrc hre hrg hrh hrr hrs hsa hsb hsc hse hsg hsh hsr hss ra- raa rab rac rae rag rah rar ras rba rbb rbc rbe rbg rbh rbr rbs rca rcb rcc rce rcg rch rcr rcs re- rea reb rec ree reg reh rer res rga rgb rgc rge rgg rgh rgr rgs rh- rha rhb rhc rhe rhg rhh rhr rhs rra rrb rrc rrg rrh rrr rrs rsa rsb rsc rse rsg rsh rsr rss saa sab sac sae sag sah sar sas sba sbb sbc sbe sbg sbh sbr sbs sca scb scc sce scg sch scr scs se- sea seb sec see seg seh ser ses sga sgb sgc sge sgg sgh sgr sgs sh- sha shb shc she shg shh shr shs sr- sra srb src sre srg srh srr srs ss- ssa ssb ssc sse ssg ssh ssr sss