a-a a-b a-c a-t aaa aab aac aae aag aak aas aat ab- aba abb abc abe abg abk abs abt ac- aca acb acc ace acg ack acs act aea aeb aec aee aeg aek aes aet ag- aga agb agc age agg agk ags agt aka akb akc ake akg akk aks as- asa asb asc ase asg ask ass ast at- ata atb atc ate atg ats att baa bab bac bae bag bak bas bat bba bbb bbc bbe bbg bbk bbs bbt bca bcb bcc bce bcg bck bcs bct be- bea beb bec bee beg bek bes bet bga bgb bgc bge bgg bgk bgs bgt bka bkb bkc bke bkg bkk bks bkt bsa bsb bsc bse bsg bsk bss bst bta btb btc bte btg btk bts btt c-- caa cab cac cae cag cak cas cat cba cbb cbc cbe cbg cbk cbs cbt cca ccb ccc cce ccg cck ccs cct ce- cea ceb cec cee ceg cek ces cet cga cgb cgc cge cgg cgs cgt cka ckb ckc cks ckt csa csb csc cse csg csk css cst cta ctb ctc cte ctg ctk cts ctt eaa eab eac eae eag eak eas eat eba ebb ebc ebe ebg ebk ebs ebt ec- eca ecb ecc ece ecg eck ecs ect eea eeb eec eee eeg eek ees eet ega egb egc ege egg egs egt eka ekb ekc eke ekg eks ekt es- esa esb esc ese esg esk ess est eta etb etc ete etg etk ets ett gaa gab gac gae gag gak gas gat gba gbc gbe gbg gbk gbs gbt gca gcb gcc gce gcg gck gcs gct ge- gea geb gec gee geg gek ges get gga ggb ggc ggg ggs ggt gka gkb gks gkt gsa gsb gsc gse gsg gsk gss gst gta gtb gtc gte gtg gtk gts gtt k-t ka- kaa kab kac kae kag kak kas kat kba kbb kbc kbe kbk kbs kca kcb kcc kce kcg kck kcs kct ke- kea keb kec kee keg kek kes ket kga kgb kgc kgs kkb kkc kke kkk kks kkt ksa ksb ksc kse ksg ksk kss kst kta ktb ktc kte ktg ktk kts ktt saa sab sac sae sag sak sas sat sba sbb sbc sbe sbg sbk sbs sbt sca scb scc sce scg sck scs sct se- sea seb sec see seg sek ses set sga sgb sgc sge sgg sgk sgs sgt sk- ska skb skc ske skg skk sks skt ss- ssa ssb ssc sse ssg ssk sss sst sta stb stc ste stg stk sts stt taa tab tac tae tag tak tas tat tba tbb tbc tbe tbg tbk tbs tbt tca tcb tcc tce tcg tck tcs tct te- tea teb tec tee teg tek tes tet tga tgb tgc tge tgg tgk tgs tgt tka tkb tkc tke tkg tkk tks tkt tsa tsb tsc tse tsg tsk tss tst tta ttb ttc tte ttg ttk tts ttt