a-a a-c a-z aaa aac aae aap aaz ac- aca acc ace acp acz aea aec aee aep aez ap- apa apc ape app az- aza aze azp azz c-- caa cac cae cap caz cca ccc cce ccp ccz ce- cea cec cee cep cez cpa cpc cpe cpp cpz cz- czc cze eaa eac eae eap eaz ec- eca ecc ece eea eec eee eep ep- epa epc epe epp epz eze ezz p-p paa pac pae pap paz pca pcc pce pcp pea pec pee pep pez ppa ppc ppe ppp ppz pzc pzp zaa zac zap zaz zce zea zec zee zep zez zpc zpe zpp zzz