a-a a-t aaa aag aan aar aat aax ag- aga agg agn agr agt agx an- ana ang ann anr ant anx ar- ara arg arn arr art arx at- ata atg atn atr att atx ax- axa axn axr axt axx gaa gag gan gar gat gga ggg ggn ggr ggt gna gnn gnr gnt gra grg grn grr grt grx gta gtg gtn gtr gtt gtx gxa gxt naa nag nan nar nat nax nga ngg ngn ngt nna nng nnn nnt nra nrg nrn nrr nrt nrx nta ntg ntn ntr ntt ntx nxt ra- raa rag ran rar rat rax rga rgg rgn rgr rgt rgx rna rng rnn rnr rnt rra rrg rrn rrr rrt rta rtg rtn rtr rtt rtx rxr t-x taa tag tan tar tat tax tga tgg tgn tgr tgt tna tng tnn tnr tnt tnx tra trg trn trr trt trx tta ttg ttn ttr ttt ttx txn txt xaa xag xan xar xat xna xrt xrx xtr xtx xxx