-er a-a a-c a-z aaa aac aae aak aar aaz ac- aca acc ace ack acr acz aea aec aee aek aer aez aka akc ake akk akr ar- ara arc are ark arr arz az- aza aze azz c-- caa cac cae cak car caz cca ccc cce cck ccr ccz ce- cea cec cee cek cer cez cka ckc cra crc cre crk crr crz cz- czc cze czk eaa eac eae eak ear eaz ec- eca ecc ece eck ecr eea eec eee eek eer eka ekc eke ekr era erc ere erk err erz eze ezr ezz k-z ka- kaa kac kae kak kar kaz kca kcc kce kck kcr ke- kea kec kee kek ker kez kkc kke kkk kkr kra krc krk krr ra- raa rac rae rak rar raz rca rcc rce rcr re- rea rec ree rek rer rez rkc rke rkk rkz rra rrc rrk rrr rza rze zaa zac zak zar zaz zce zea zec zee zek zer zez zka zzr zzz