a-a a-b a-c aaa aab aac aag aah aas ab- aba abb abc abg abh abs ac- aca acb acc acg ach acs ag- aga agb agc agg agh ags aha ahb ahc ahg ahh ahs as- asa asb asc asg ash ass baa bab bac bag bah bas bba bbb bbc bbg bbh bbs bca bcb bcc bcg bch bcs bga bgb bgc bgg bgh bgs bha bhb bhc bhg bhh bhs bsa bsb bsc bsg bsh bss c-- caa cab cac cag cah cas cba cbb cbc cbg cbh cbs cca ccb ccc ccg cch ccs cga cgb cgc cgg cgh cgs ch- cha chb chc chg chh chs csa csb csc csg csh css gaa gab gac gag gah gas gba gbc gbg gbh gbs gca gcb gcc gcg gch gcs gga ggb ggc ggg ggh ggs gha ghb ghc ghg ghh ghs gsa gsb gsc gsg gss haa hab hac hag hah has hba hbb hbc hbg hbh hbs hca hcb hcc hcg hch hcs hga hgb hgc hgg hgh hgs hha hhb hhc hhg hhh hhs hsa hsb hsc hsg hsh hss saa sab sac sag sah sas sba sbb sbc sbg sbh sbs sca scb scc scg sch scs sga sgb sgc sgg sgh sgs sh- sha shb shc shg shh shs ss- ssa ssb ssc ssg ssh sss