a-a a-b aaa aab aae aag aah aas ab- aba abb abe abg abh abs aea aeb aee aeg aeh aes ag- aga agb age agg agh ags aha ahb ahe ahg ahh ahs as- asa asb ase asg ash ass baa bab bae bag bah bas bba bbb bbe bbg bbh bbs be- bea beb bee beg beh bes bga bgb bge bgg bgh bgs bha bhb bhe bhg bhh bhs bsa bsb bse bsg bsh bss eaa eab eae eag eah eas eba ebb ebe ebg ebh ebs eea eeb eee eeg ees ega egb ege egg egh egs eha ehb ehe ehg ehh ehs es- esa esb ese esg esh ess gaa gab gae gag gah gas gba gbe gbg gbh gbs ge- gea geb gee geg geh ges gga ggb ggg ggh ggs gha ghb ghe ghg ghh ghs gsa gsb gse gsg gss haa hab hae hag hah has hba hbb hbe hbg hbh hbs he- hea heb hee heg heh hes hga hgb hge hgg hgh hgs hha hhb hhe hhg hhh hhs hsa hsb hse hsg hsh hss saa sab sae sag sah sas sba sbb sbe sbg sbh sbs se- sea seb see seg seh ses sga sgb sge sgg sgh sgs sh- sha shb she shg shh shs ss- ssa ssb sse ssg ssh sss