-er -ic c-- ccc ccd cce cci cck ccp ccr cdc cdd cde cdi cdk cdp cdr ce- cec ced cee cei cek cep cer ci- cic cid cie cii cik cip cir ckc ckd cki cpc cpd cpe cpi cpk cpp cpr crc crd cre cri crk crp crr dcc dcd dce dci dck dcp dcr ddc ddd dde ddi ddk ddp ddr de- dec ded dee dei dek dep der di- dic did die dii dik dip dir dkc dke dki dkk dkp dkr dpc dpd dpe dpi dpk dpp dpr drc drd dre dri drk drp drr ec- ecc ecd ece eci eck ecr ed- edc edd ede edi edk edp edr eec eed eee eek eep eer eic eid eie eii eik eip eir ekc ekd eke eki ekp ekr ep- epc epd epe epi epp epr erc erd ere eri erk erp err i-d icc icd ice ici ick icp icr idc idd ide idi idk idp idr ie- iec ied iee iei iek iep ier iic iid iie iii iip iir ikc ike iki ikk ikr ipc ipd ipe ipi ipp ipr ir- irc ird ire iri irk irp irr kcc kcd kce kci kck kcp kcr kdc kde kdk kdp kdr ke- kec ked kee kei kek kep ker kic kid kie kii kik kip kir kkc kke kki kkk kkp kkr kpc kpd kpe kpi kpk kpp kpr krc krd kri krk krp krr p-p pcc pcd pce pci pck pcp pcr pdc pdd pde pdi pdk pdp pdr pec ped pee pei pek pep per pic pid pie pii pik pip pir pkc pkd pke pki pkp pkr ppc ppd ppe ppi ppk ppp ppr prc prd pre pri prk prp prr rcc rcd rce rci rcp rcr rdc rdd rde rdi rdp rdr re- rec red ree rei rek rep rer ric rid rie rii rik rip rir rkc rke rkk rkp rpc rpd rpe rpi rpk rpp rpr rrc rrd rri rrk rrp rrr