-er -ic c-- ccc ccd cce cci ccp ccr cdc cdd cde cdi cdp cdr ce- cec ced cee cei cep cer ci- cic cid cie cii cip cir cpc cpd cpe cpi cpp cpr crc crd cre cri crp crr dcc dcd dce dci dcp dcr ddc ddd dde ddi ddp ddr de- dec ded dee dei dep der di- dic did die dii dip dir dpc dpd dpe dpi dpp dpr drc drd dre dri drp drr ec- ecc ecd ece eci ecr ed- edc edd ede edi edp edr eec eed eee eep eer eic eid eie eii eip eir ep- epc epd epe epi epp epr erc erd ere eri erp err i-d icc icd ice ici icp icr idc idd ide idi idp idr ie- iec ied iee iei iep ier iic iid iie iii iip iir ipc ipd ipe ipi ipp ipr ir- irc ird ire iri irp irr p-p pcc pcd pce pci pcp pcr pdc pdd pde pdi pdp pdr pec ped pee pei pep per pic pid pie pii pip pir ppc ppd ppe ppi ppp ppr prc prd pre pri prp prr rcc rcd rce rci rcp rcr rdc rdd rde rdi rdp rdr re- rec red ree rei rep rer ric rid rie rii rip rir rpc rpd rpe rpi rpp rpr rrc rrd rri rrp rrr