a-a a-t aaa aag aao aar aat aax ag- aga agg ago agr agt agx aoa aog aoo aor aot aox ar- ara arg aro arr art arx at- ata atg ato atr att atx ax- axa axo axr axt axx gaa gag gao gar gat gga ggg ggo ggr ggt goa gog goo gor got gox gra grg gro grr grt grx gta gtg gto gtr gtt gtx gxa gxt oaa oag oao oar oat oax oga ogg ogo ogt ogx oo- ooa oog ooo oor oot oox or- ora org oro orr ort orx ot- ota otg oto otr ott ox- oxa oxo oxt oxx ra- raa rag rao rar rat rax rga rgg rgo rgr rgt rgx roa rog roo ror rot rox rra rrg rrr rrt rta rtg rto rtr rtt rtx rxr t-x taa tag tao tar tat tax tga tgg tgo tgr tgt to- toa tog too tor tot tox tra trg tro trr trt trx tta ttg tto ttr ttt ttx txt xaa xag xar xat xoa xog xoo xor xot xox xrt xrx xtr xtx xxo xxx