a-a a-c a-z aaa aac aag aao aar aaz ac- aca acc acg aco acr acz ag- aga agc agg ago agr agz aoa aoc aog aoo aor ar- ara arc arg aro arr arz az- aza azg azo azz c-- caa cac cag cao car caz cca ccc ccg cco ccr ccz cga cgc cgg cgo cgr co- coa coc cog coo cor coz cra crc crg cro crr crz cz- czc czo gaa gac gag gao gar gaz gca gcc gcg gco gcr gga ggc ggg ggo ggr ggz goa goc gog goo gor goz gra grc grg gro grr gza gzo gzr oaa oac oag oao oar oc- oca occ ocg oco ocr ocz oga ogc ogg ogo oo- ooa ooc oog ooo oor or- ora orc org oro orr orz oza ozo ozz ra- raa rac rag rao rar raz rca rcc rcg rco rcr rga rgc rgg rgo rgr roa roc rog roo ror roz rra rrc rrg rrr rza rzo z-g zaa zac zag zao zar zaz zco zgg zo- zoa zoc zog zoo zor zro zzr zzz