a-a a-b a-t aaa aab aae aag aak aas aat ab- aba abb abe abg abk abs abt aea aeb aee aeg aek aes aet ag- aga agb age agg agk ags agt aka akb ake akg akk aks as- asa asb ase asg ask ass ast at- ata atb ate atg ats att baa bab bae bag bak bas bat bba bbb bbe bbg bbk bbs bbt be- bea beb bee beg bek bes bet bga bgb bge bgg bgk bgs bgt bka bkb bke bkg bkk bks bkt bsa bsb bse bsg bsk bss bst bta btb bte btg btk bts btt eaa eab eae eag eak eas eat eba ebb ebe ebg ebk ebs ebt eea eeb eee eeg eek ees eet ega egb ege egg egs egt eka ekb eke ekg eks ekt es- esa esb ese esg esk ess est eta etb ete etg etk ets ett gaa gab gae gag gak gas gat gba gbe gbg gbk gbs gbt ge- gea geb gee geg gek ges get gga ggb ggg ggs ggt gka gkb gks gkt gsa gsb gse gsg gsk gss gst gta gtb gte gtg gtk gts gtt k-t ka- kaa kab kae kag kak kas kat kba kbb kbe kbk kbs ke- kea keb kee keg kek kes ket kga kgb kgs kkb kke kkk kks kkt ksa ksb kse ksg ksk kss kst kta ktb kte ktg ktk kts ktt saa sab sae sag sak sas sat sba sbb sbe sbg sbk sbs sbt se- sea seb see seg sek ses set sga sgb sge sgg sgk sgs sgt sk- ska skb ske skg skk sks skt ss- ssa ssb sse ssg ssk sss sst sta stb ste stg stk sts stt taa tab tae tag tak tas tat tba tbb tbe tbg tbk tbs tbt te- tea teb tee teg tek tes tet tga tgb tge tgg tgk tgs tgt tka tkb tke tkg tkk tks tkt tsa tsb tse tsg tsk tss tst tta ttb tte ttg ttk tts ttt