-er -ic a-a a-c a-i aaa aac aae aai aak aao aar ac- aca acc ace aci ack aco acr aea aec aee aei aek aeo aer ai- aia aic aie aii aik aio air aka akc ake aki akk ako akr aoa aoc aoe aoi aok aoo aor ar- ara arc are ari ark aro arr c-- caa cac cae cai cak cao car cca ccc cce cci cck cco ccr ce- cea cec cee cei cek ceo cer ci- cia cic cie cii cik cio cir cka ckc cki cko co- coa coc coe coi cok coo cor cra crc cre cri crk cro crr eaa eac eae eai eak eao ear ec- eca ecc ece eci eck eco ecr eea eec eee eek eeo eer eia eic eie eii eik eio eir eka ekc eke eki eko ekr eo- eoa eoc eoe eoi eok eoo eor era erc ere eri erk ero err ia- iaa iac iae iai iao iar ica icc ice ici ick ico icr ie- iea iec iee iei iek ier iia iic iie iii iio iir ika ikc ike iki ikk iko ikr io- ioa ioc ioe ioi ioo ior ir- ira irc ire iri irk iro irr ka- kaa kac kae kai kak kao kar kca kcc kce kci kck kcr ke- kea kec kee kei kek keo ker kia kic kie kii kik kio kir kkc kke kki kkk kkr koa koc koe koi kok koo kor kra krc kri krk kro krr o-i oaa oac oae oai oak oao oar oc- oca occ oci ock oco ocr oea oec oee oei oeo oer oia oic oie oii oik oio oir oka okc oke oki okk oko okr oo- ooa ooc ooi ook ooo oor or- ora orc ore ori ork oro orr ra- raa rac rae rai rak rao rar rca rcc rce rci rco rcr re- rea rec ree rei rek reo rer ria ric rie rii rik rio rir rkc rke rkk rko roa roc roe roi rok roo ror rra rrc rri rrk rrr