-er -ic a-a a-c a-i aaa aac aae aai aak aao aap aar ac- aca acc ace aci ack aco acp acr aea aec aee aei aek aeo aep aer ai- aia aic aie aii aik aio aip air aka akc ake aki akk ako akp akr aoa aoc aoe aoi aok aoo aop aor ap- apa apc ape api apk apo app apr ar- ara arc are ari ark aro arp arr c-- caa cac cae cai cak cao cap car cca ccc cce cci cck cco ccp ccr ce- cea cec cee cei cek ceo cep cer ci- cia cic cie cii cik cio cip cir cka ckc cki cko co- coa coc coe coi cok coo cop cor cpa cpc cpe cpi cpk cpo cpp cpr cra crc cre cri crk cro crp crr eaa eac eae eai eak eao eap ear ec- eca ecc ece eci eck eco ecr eea eec eee eek eeo eep eer eia eic eie eii eik eio eip eir eka ekc eke eki eko ekp ekr eo- eoa eoc eoe eoi eok eoo eop eor ep- epa epc epe epi epo epp epr era erc ere eri erk ero erp err ia- iaa iac iae iai iao iap iar ica icc ice ici ick ico icp icr ie- iea iec iee iei iek iep ier iia iic iie iii iio iip iir ika ikc ike iki ikk iko ikr io- ioa ioc ioe ioi ioo iop ior ipa ipc ipe ipi ipo ipp ipr ir- ira irc ire iri irk iro irp irr ka- kaa kac kae kai kak kao kap kar kca kcc kce kci kck kcp kcr ke- kea kec kee kei kek keo kep ker kia kic kie kii kik kio kip kir kkc kke kki kkk kkp kkr koa koc koe koi kok koo kop kor kpa kpc kpe kpi kpk kpo kpp kpr kra krc kri krk kro krp krr o-i oaa oac oae oai oak oao oap oar oc- oca occ oci ock oco ocp ocr oea oec oee oei oeo oep oer oia oic oie oii oik oio oip oir oka okc oke oki okk oko okp okr oo- ooa ooc ooi ook ooo oop oor op- opa opc ope opi opk opo opp opr or- ora orc ore ori ork oro orp orr p-p paa pac pae pai pak pao pap par pca pcc pce pci pck pco pcp pcr pea pec pee pei pek peo pep per pia pic pie pii pik pio pip pir pka pkc pke pki pko pkp pkr poa poc poe poi pok poo pop por ppa ppc ppe ppi ppk ppo ppp ppr pra prc pre pri prk pro prp prr ra- raa rac rae rai rak rao rap rar rca rcc rce rci rco rcp rcr re- rea rec ree rei rek reo rep rer ria ric rie rii rik rio rip rir rkc rke rkk rko rkp roa roc roe roi rok roo rop ror rpa rpc rpe rpi rpk rpo rpp rpr rra rrc rri rrk rrp rrr