a-a a-c a-z aaa aac aag aar aau aaz ac- aca acc acg acr acu acz ag- aga agc agg agr agu agz ar- ara arc arg arr aru arz au- aua auc aug aur auz az- aza azg azu azz c-- caa cac cag car cau caz cca ccc ccg ccr ccu ccz cga cgc cgg cgr cgu cra crc crg crr cru crz cua cuc cug cur cuu cuz cz- czc gaa gac gag gar gau gaz gca gcc gcg gcr gcu gga ggc ggg ggr ggu ggz gra grc grg grr gru gu- gua guc gug gur guu guz gza gzr gzu ra- raa rac rag rar rau raz rca rcc rcg rcr rcu rga rgc rgg rgr rra rrc rrg rrr rru rua ruc rug rur ruu ruz rza ua- uaa uac uag uar uau uaz uca ucc ucg ucr ucu uga ugc ugg ugr ugu ur- ura urc urg urr uru urz uua uuc uug uur uuu uza uzu z-g zaa zac zag zar zaz zgg zuc zug zur zuz zzr zzz