a-a a-c a-z aaa aac aae aag aao aap aaz ac- aca acc ace acg aco acp acz aea aec aee aeg aeo aep aez ag- aga agc age agg ago agp agz aoa aoc aoe aog aoo aop ap- apa apc ape apg apo app az- aza aze azg azo azp azz c-- caa cac cae cag cao cap caz cca ccc cce ccg cco ccp ccz ce- cea cec cee ceg ceo cep cez cga cgc cge cgg cgo cgp co- coa coc coe cog coo cop coz cpa cpc cpe cpg cpo cpp cpz cz- czc cze czo eaa eac eae eag eao eap eaz ec- eca ecc ece ecg eco eea eec eee eeg eeo eep ega egc ege egg ego egp eo- eoa eoc eoe eog eoo eop ep- epa epc epe epg epo epp epz eze ezo ezz g-p gaa gac gae gag gao gap gaz gca gcc gce gcg gco gcp ge- gea gec gee geg geo gep gez gga ggc ggg ggo ggp ggz goa goc goe gog goo gop goz gpa gpc gpe gpg gpo gpp gpz gza gzo gzp oaa oac oae oag oao oap oc- oca occ ocg oco ocp ocz oea oec oee oeg oeo oep oga ogc oge ogg ogo ogp oo- ooa ooc oog ooo oop op- opa opc ope opg opo opp oza oze ozo ozz p-p paa pac pae pag pao pap paz pca pcc pce pcg pco pcp pea pec pee peg peo pep pez pga pgc pge pgg pgo pgp poa poc poe pog poo pop poz ppa ppc ppe ppg ppo ppp ppz pzc pzp z-g zaa zac zag zao zap zaz zce zco zea zec zee zeo zep zez zgg zo- zoa zoc zoe zog zoo zpc zpe zpg zpo zpp zzz