a-a a-b a-c a-t aaa aab aac aae aag aak aat ab- aba abb abc abe abg abk abt ac- aca acb acc ace acg ack act aea aeb aec aee aeg aek aet ag- aga agb agc age agg agk agt aka akb akc ake akg akk at- ata atb atc ate atg att baa bab bac bae bag bak bat bba bbb bbc bbe bbg bbk bbt bca bcb bcc bce bcg bck bct be- bea beb bec bee beg bek bet bga bgb bgc bge bgg bgk bgt bka bkb bkc bke bkg bkk bkt bta btb btc bte btg btk btt c-- caa cab cac cae cag cak cat cba cbb cbc cbe cbg cbk cbt cca ccb ccc cce ccg cck cct ce- cea ceb cec cee ceg cek cet cga cgb cgc cge cgg cgt cka ckb ckc ckt cta ctb ctc cte ctg ctk ctt eaa eab eac eae eag eak eat eba ebb ebc ebe ebg ebk ebt ec- eca ecb ecc ece ecg eck ect eea eeb eec eee eeg eek eet ega egb egc ege egg egt eka ekb ekc eke ekg ekt eta etb etc ete etg etk ett gaa gab gac gae gag gak gat gba gbc gbe gbg gbk gbt gca gcb gcc gce gcg gck gct ge- gea geb gec gee geg gek get gga ggb ggc ggg ggt gka gkb gkt gta gtb gtc gte gtg gtk gtt k-t ka- kaa kab kac kae kag kak kat kba kbb kbc kbe kbk kca kcb kcc kce kcg kck kct ke- kea keb kec kee keg kek ket kga kgb kgc kkb kkc kke kkk kkt kta ktb ktc kte ktg ktk ktt taa tab tac tae tag tak tat tba tbb tbc tbe tbg tbk tbt tca tcb tcc tce tcg tck tct te- tea teb tec tee teg tek tet tga tgb tgc tge tgg tgk tgt tka tkb tkc tke tkg tkk tkt tta ttb ttc tte ttg ttk ttt