a-a a-b a-c a-t aaa aab aac aag aas aat ab- aba abb abc abg abs abt ac- aca acb acc acg acs act ag- aga agb agc agg ags agt as- asa asb asc asg ass ast at- ata atb atc atg ats att baa bab bac bag bas bat bba bbb bbc bbg bbs bbt bca bcb bcc bcg bcs bct bga bgb bgc bgg bgs bgt bsa bsb bsc bsg bss bst bta btb btc btg bts btt c-- caa cab cac cag cas cat cba cbb cbc cbg cbs cbt cca ccb ccc ccg ccs cct cga cgb cgc cgg cgs cgt csa csb csc csg css cst cta ctb ctc ctg cts ctt gaa gab gac gag gas gat gba gbc gbg gbs gbt gca gcb gcc gcg gcs gct gga ggb ggc ggg ggs ggt gsa gsb gsc gsg gss gst gta gtb gtc gtg gts gtt saa sab sac sag sas sat sba sbb sbc sbg sbs sbt sca scb scc scg scs sct sga sgb sgc sgg sgs sgt ss- ssa ssb ssc ssg sss sst sta stb stc stg sts stt taa tab tac tag tas tat tba tbb tbc tbg tbs tbt tca tcb tcc tcg tcs tct tga tgb tgc tgg tgs tgt tsa tsb tsc tsg tss tst tta ttb ttc ttg tts ttt