-er -ic c-- ccc ccd cce cci cck cco ccp ccr cdc cdd cde cdi cdk cdo cdp cdr ce- cec ced cee cei cek ceo cep cer ci- cic cid cie cii cik cio cip cir ckc ckd cki cko co- coc cod coe coi cok coo cop cor cpc cpd cpe cpi cpk cpo cpp cpr crc crd cre cri crk cro crp crr dcc dcd dce dci dck dco dcp dcr ddc ddd dde ddi ddk ddo ddp ddr de- dec ded dee dei dek deo dep der di- dic did die dii dik dio dip dir dkc dke dki dkk dko dkp dkr doc dod doe doi dok doo dop dor dpc dpd dpe dpi dpk dpo dpp dpr drc drd dre dri drk dro drp drr ec- ecc ecd ece eci eck eco ecr ed- edc edd ede edi edk edo edp edr eec eed eee eek eeo eep eer eic eid eie eii eik eio eip eir ekc ekd eke eki eko ekp ekr eo- eoc eod eoe eoi eok eoo eop eor ep- epc epd epe epi epo epp epr erc erd ere eri erk ero erp err i-d icc icd ice ici ick ico icp icr idc idd ide idi idk ido idp idr ie- iec ied iee iei iek iep ier iic iid iie iii iio iip iir ikc ike iki ikk iko ikr io- ioc iod ioe ioi ioo iop ior ipc ipd ipe ipi ipo ipp ipr ir- irc ird ire iri irk iro irp irr kcc kcd kce kci kck kcp kcr kdc kde kdk kdo kdp kdr ke- kec ked kee kei kek keo kep ker kic kid kie kii kik kio kip kir kkc kke kki kkk kkp kkr koc kod koe koi kok koo kop kor kpc kpd kpe kpi kpk kpo kpp kpr krc krd kri krk kro krp krr o-i oc- occ ocd oci ock oco ocp ocr odc odd ode odi odo odp odr oec oed oee oei oeo oep oer oic oid oie oii oik oio oip oir okc okd oke oki okk oko okp okr oo- ooc ood ooi ook ooo oop oor op- opc opd ope opi opk opo opp opr or- orc ord ore ori ork oro orp orr p-p pcc pcd pce pci pck pco pcp pcr pdc pdd pde pdi pdk pdo pdp pdr pec ped pee pei pek peo pep per pic pid pie pii pik pio pip pir pkc pkd pke pki pko pkp pkr poc pod poe poi pok poo pop por ppc ppd ppe ppi ppk ppo ppp ppr prc prd pre pri prk pro prp prr rcc rcd rce rci rco rcp rcr rdc rdd rde rdi rdo rdp rdr re- rec red ree rei rek reo rep rer ric rid rie rii rik rio rip rir rkc rke rkk rko rkp roc rod roe roi rok roo rop ror rpc rpd rpe rpi rpk rpo rpp rpr rrc rrd rri rrk rrp rrr