-er a-a a-c a-z aaa aac aae aag aao aar aaz ac- aca acc ace acg aco acr acz aea aec aee aeg aeo aer aez ag- aga agc age agg ago agr agz aoa aoc aoe aog aoo aor ar- ara arc are arg aro arr arz az- aza aze azg azo azz c-- caa cac cae cag cao car caz cca ccc cce ccg cco ccr ccz ce- cea cec cee ceg ceo cer cez cga cgc cge cgg cgo cgr co- coa coc coe cog coo cor coz cra crc cre crg cro crr crz cz- czc cze czo eaa eac eae eag eao ear eaz ec- eca ecc ece ecg eco ecr eea eec eee eeg eeo eer ega egc ege egg ego egr eo- eoa eoc eoe eog eoo eor era erc ere erg ero err erz eze ezo ezr ezz gaa gac gae gag gao gar gaz gca gcc gce gcg gco gcr ge- gea gec gee geg geo ger gez gga ggc ggg ggo ggr ggz goa goc goe gog goo gor goz gra grc gre grg gro grr gza gzo gzr oaa oac oae oag oao oar oc- oca occ ocg oco ocr ocz oea oec oee oeg oeo oer oga ogc oge ogg ogo oo- ooa ooc oog ooo oor or- ora orc ore org oro orr orz oza oze ozo ozz ra- raa rac rae rag rao rar raz rca rcc rce rcg rco rcr re- rea rec ree reg reo rer rez rga rgc rge rgg rgo rgr roa roc roe rog roo ror roz rra rrc rrg rrr rza rze rzo z-g zaa zac zag zao zar zaz zce zco zea zec zee zeo zer zez zgg zo- zoa zoc zoe zog zoo zor zro zzr zzz