-er -ic a-a a-c a-i aaa aac aae aai aak aar ac- aca acc ace aci ack acr aea aec aee aei aek aer ai- aia aic aie aii aik air aka akc ake aki akk akr ar- ara arc are ari ark arr c-- caa cac cae cai cak car cca ccc cce cci cck ccr ce- cea cec cee cei cek cer ci- cia cic cie cii cik cir cka ckc cki cra crc cre cri crk crr eaa eac eae eai eak ear ec- eca ecc ece eci eck ecr eea eec eee eek eer eia eic eie eii eik eir eka ekc eke eki ekr era erc ere eri erk err ia- iaa iac iae iai iar ica icc ice ici ick icr ie- iea iec iee iei iek ier iia iic iie iii iir ika ikc ike iki ikk ikr ir- ira irc ire iri irk irr ka- kaa kac kae kai kak kar kca kcc kce kci kck kcr ke- kea kec kee kei kek ker kia kic kie kii kik kir kkc kke kki kkk kkr kra krc kri krk krr ra- raa rac rae rai rak rar rca rcc rce rci rcr re- rea rec ree rei rek rer ria ric rie rii rik rir rkc rke rkk rra rrc rri rrk rrr