a-a a-i a-t aaa aag aai aas aat aax ag- aga agg agi ags agt agx ai- aia aig aii ais ait aix as- asa asg asi ass ast asx at- ata atg ati ats att atx ax- axa axi axs axt axx gaa gag gai gas gat gga ggg ggi ggs ggt gia gig gii gis git gsa gsg gsi gss gst gsx gta gtg gti gts gtt gtx gxa gxs gxt ia- iaa iag iai ias iat iga igg igi igs igt iia iii iis iit iix is- isa isg isi iss ist ita itg iti its itt itx ixi saa sag sai sas sat sax sga sgg sgi sgs sgt sgx sia sig sii sis sit six ss- ssa ssg ssi sss sst ssx sta stg sti sts stt stx sxi sxs sxt t-x taa tag tai tas tat tax tga tgg tgi tgs tgt tia tig tii tis tit tix tsa tsg tsi tss tst tsx tta ttg tti tts ttt ttx txi txs txt xaa xag xas xat xgi xia xii xis xit xix xsa xsi xss xst xti xts xtx xxi xxx