-ic a-a a-c a-i a-t aaa aac aae aag aai aao aat aax ac- aca acc ace acg aci aco act acx aea aec aee aeg aei aeo aet aex ag- aga agc age agg agi ago agt agx ai- aia aic aie aig aii aio ait aix aoa aoc aoe aog aoi aoo aot aox at- ata atc ate atg ati ato att atx ax- axa axe axi axo axt axx c-- caa cac cae cag cai cao cat cax cca ccc cce ccg cci cco cct ccx ce- cea cec cee ceg cei ceo cet cex cga cgc cge cgg cgi cgo cgt ci- cia cic cie cig cii cio cit cix co- coa coc coe cog coi coo cot cox cta ctc cte ctg cti cto ctt ctx cxc cxi cxo cxt cxx eaa eac eae eag eai eao eat eax ec- eca ecc ece ecg eci eco ect ecx eea eec eee eeg eeo eet eex ega egc ege egg egi ego egt egx eia eic eie eig eii eio eit eix eo- eoa eoc eoe eog eoi eoo eot eta etc ete etg eti eto ett etx ex- exa exc exe exi exo ext exx gaa gac gae gag gai gao gat gca gcc gce gcg gci gco gct ge- gea gec gee geg gei geo get gex gga ggc ggg ggi ggo ggt gia gic gie gig gii gio git goa goc goe gog goi goo got gox gta gtc gte gtg gti gto gtt gtx gxa gxt ia- iaa iac iae iag iai iao iat ica icc ice icg ici ico ict ie- iea iec iee ieg iei iet iex iga igc ige igg igi igo igt iia iic iie iii iio iit iix io- ioa ioc ioe iog ioi ioo iot ita itc ite itg iti ito itt itx ixc ixe ixi o-i oaa oac oae oag oai oao oat oax oc- oca occ ocg oci oco oct ocx oea oec oee oeg oei oeo oet oex oga ogc oge ogg ogi ogo ogt ogx oia oic oie oii oio oit oo- ooa ooc oog ooi ooo oot oox ot- ota otc ote otg oti oto ott ox- oxa oxc oxi oxo oxt oxx t-x taa tac tae tag tai tao tat tax tca tcc tce tcg tci tco tct tcx te- tea tec tee teg tei teo tet tex tga tgc tge tgg tgi tgo tgt tia tic tie tig tii tio tit tix to- toa toc toe tog toi too tot tox tta ttc tte ttg tti tto ttt ttx txe txi txt xaa xac xag xat xci xcx xee xeg xet xex xge xgi xia xic xie xii xio xit xix xoa xoc xog xoi xoo xot xox xtc xti xtx xxi xxo xxx