-er -ic a-a a-c a-i aaa aac aae aaf aai aak aao aap aar ac- aca acc ace acf aci ack aco acp acr aea aec aee aef aei aek aeo aep aer af- afa afc afe aff afi afk afo afp afr ai- aia aic aie aif aii aik aio aip air aka akc ake aki akk ako akp akr aoa aoc aoe aof aoi aok aoo aop aor ap- apa apc ape apf api apk apo app apr ar- ara arc are arf ari ark aro arp arr c-- caa cac cae caf cai cak cao cap car cca ccc cce ccf cci cck cco ccp ccr ce- cea cec cee cef cei cek ceo cep cer cfa cfc cfe cff cfi cfk cfo cfp cfr ci- cia cic cie cif cii cik cio cip cir cka ckc cki cko co- coa coc coe cof coi cok coo cop cor cpa cpc cpe cpf cpi cpk cpo cpp cpr cra crc cre crf cri crk cro crp crr eaa eac eae eaf eai eak eao eap ear ec- eca ecc ece ecf eci eck eco ecr eea eec eee eef eek eeo eep eer ef- efa efc efe eff efi efo efp efr eia eic eie eif eii eik eio eip eir eka ekc eke ekf eki eko ekp ekr eo- eoa eoc eoe eof eoi eok eoo eop eor ep- epa epc epe epf epi epo epp epr era erc ere erf eri erk ero erp err faa fac fae faf fai fak fao fap far fca fcc fce fcf fci fck fco fcp fcr fea fec fee fef fei fek feo fep fer ffa ffc ffe fff ffi ffk ffo ffp ffr fia fic fie fif fii fik fip fir fka fkc fkf fki fkk fkp foa foc foe fof foi fok foo fop for fpa fpc fpe fpi fpk fpo fpp fpr fra frc fre frf fri frk fro frp frr i-f ia- iaa iac iae iaf iai iao iap iar ica icc ice icf ici ick ico icp icr ie- iea iec iee ief iei iek iep ier ifa ifc ife iff ifi ifo ifp ifr iia iic iie iif iii iio iip iir ika ikc ike ikf iki ikk iko ikr io- ioa ioc ioe iof ioi ioo iop ior ipa ipc ipe ipf ipi ipo ipp ipr ir- ira irc ire irf iri irk iro irp irr ka- kaa kac kae kaf kai kak kao kap kar kca kcc kce kci kck kcp kcr ke- kea kec kee kef kei kek keo kep ker kfa kfc kff kfi kfo kia kic kie kif kii kik kio kip kir kkc kke kki kkk kkp kkr koa koc koe kof koi kok koo kop kor kpa kpc kpe kpf kpi kpk kpo kpp kpr kra krc krf kri krk kro krp krr o-i oaa oac oae oaf oai oak oao oap oar oc- oca occ ocf oci ock oco ocp ocr oea oec oee oef oei oeo oep oer of- ofa ofc ofe off ofi ofo ofp ofr oia oic oie oif oii oik oio oip oir oka okc oke oki okk oko okp okr oo- ooa ooc oof ooi ook ooo oop oor op- opa opc ope opf opi opk opo opp opr or- ora orc ore orf ori ork oro orp orr p-p paa pac pae paf pai pak pao pap par pca pcc pce pcf pci pck pco pcp pcr pea pec pee pef pei pek peo pep per pfa pfc pfe pff pfi pfk pfo pfp pfr pia pic pie pif pii pik pio pip pir pka pkc pke pkf pki pko pkp pkr poa poc poe pof poi pok poo pop por ppa ppc ppe ppf ppi ppk ppo ppp ppr pra prc pre prf pri prk pro prp prr ra- raa rac rae raf rai rak rao rap rar rca rcc rce rcf rci rco rcp rcr re- rea rec ree ref rei rek reo rep rer rfa rfc rfe rff rfi rfk rfo rfp rfr ria ric rie rif rii rik rio rip rir rkc rke rkf rkk rko rkp roa roc roe rof roi rok roo rop ror rpa rpc rpe rpf rpi rpk rpo rpp rpr rra rrc rrf rri rrk rrp rrr