-ic a-a a-b a-c a-i a-t aaa aab aac aag aai aat ab- aba abb abc abg abi abt ac- aca acb acc acg aci act ag- aga agb agc agg agi agt ai- aia aib aic aig aii ait at- ata atb atc atg ati att baa bab bac bag bai bat bba bbb bbc bbg bbi bbt bca bcb bcc bcg bci bct bga bgb bgc bgg bgi bgt bi- bia bib bic big bii bit bta btb btc btg bti btt c-- caa cab cac cag cai cat cba cbb cbc cbg cbi cbt cca ccb ccc ccg cci cct cga cgb cgc cgg cgi cgt ci- cia cib cic cig cii cit cta ctb ctc ctg cti ctt gaa gab gac gag gai gat gba gbc gbg gbi gbt gca gcb gcc gcg gci gct gga ggb ggc ggg ggi ggt gia gib gic gig gii git gta gtb gtc gtg gti gtt ia- iaa iab iac iag iai iat iba ibb ibc ibg ibi ibt ica icb icc icg ici ict iga igb igc igg igi igt iia iib iic iii iit ita itb itc itg iti itt taa tab tac tag tai tat tba tbb tbc tbg tbi tbt tca tcb tcc tcg tci tct tga tgb tgc tgg tgi tgt tia tib tic tig tii tit tta ttb ttc ttg tti ttt