a-a a-c a-t a-z aaa aac aae aap aat aaz ac- aca acc ace acp act acz aea aec aee aep aet aez ap- apa apc ape app apt at- ata atc ate atp att atz az- aza aze azp azt azz c-- caa cac cae cap cat caz cca ccc cce ccp cct ccz ce- cea cec cee cep cet cez cpa cpc cpe cpp cpt cpz cta ctc cte ctp ctt ctz cz- czc cze czt eaa eac eae eap eat eaz ec- eca ecc ece ect eea eec eee eep eet ep- epa epc epe epp ept epz eta etc ete etp ett etz eze ezz p-p paa pac pae pap pat paz pca pcc pce pcp pct pea pec pee pep pet pez ppa ppc ppe ppp ppt ppz pt- pta ptc pte ptp ptt ptz pzc pzp pzt taa tac tae tap tat taz tca tcc tce tcp tct te- tea tec tee tep tet tez tpa tpc tpe tpp tpt tpz tta ttc tte ttp ttt tza tze zaa zac zap zat zaz zce zea zec zee zep zet zez zpc zpe zpp zpt zta zte zzt zzz