a-a a-b a-c aaa aab aac aae aag aah aas ab- aba abb abc abe abg abh abs ac- aca acb acc ace acg ach acs aea aeb aec aee aeg aeh aes ag- aga agb agc age agg agh ags aha ahb ahc ahe ahg ahh ahs as- asa asb asc ase asg ash ass baa bab bac bae bag bah bas bba bbb bbc bbe bbg bbh bbs bca bcb bcc bce bcg bch bcs be- bea beb bec bee beg beh bes bga bgb bgc bge bgg bgh bgs bha bhb bhc bhe bhg bhh bhs bsa bsb bsc bse bsg bsh bss c-- caa cab cac cae cag cah cas cba cbb cbc cbe cbg cbh cbs cca ccb ccc cce ccg cch ccs ce- cea ceb cec cee ceg ceh ces cga cgb cgc cge cgg cgh cgs ch- cha chb chc che chg chh chs csa csb csc cse csg csh css eaa eab eac eae eag eah eas eba ebb ebc ebe ebg ebh ebs ec- eca ecb ecc ece ecg ech ecs eea eeb eec eee eeg ees ega egb egc ege egg egh egs eha ehb ehc ehe ehg ehh ehs es- esa esb esc ese esg esh ess gaa gab gac gae gag gah gas gba gbc gbe gbg gbh gbs gca gcb gcc gce gcg gch gcs ge- gea geb gec gee geg geh ges gga ggb ggc ggg ggh ggs gha ghb ghc ghe ghg ghh ghs gsa gsb gsc gse gsg gss haa hab hac hae hag hah has hba hbb hbc hbe hbg hbh hbs hca hcb hcc hce hcg hch hcs he- hea heb hec hee heg heh hes hga hgb hgc hge hgg hgh hgs hha hhb hhc hhe hhg hhh hhs hsa hsb hsc hse hsg hsh hss saa sab sac sae sag sah sas sba sbb sbc sbe sbg sbh sbs sca scb scc sce scg sch scs se- sea seb sec see seg seh ses sga sgb sgc sge sgg sgh sgs sh- sha shb shc she shg shh shs ss- ssa ssb ssc sse ssg ssh sss