-er -ic c-- ccc ccd cce cci ccr cdc cdd cde cdi cdr ce- cec ced cee cei cer ci- cic cid cie cii cir crc crd cre cri crr dcc dcd dce dci dcr ddc ddd dde ddi ddr de- dec ded dee dei der di- dic did die dii dir drc drd dre dri drr ec- ecc ecd ece eci ecr ed- edc edd ede edi edr eec eed eee eer eic eid eie eii eir erc erd ere eri err i-d icc icd ice ici icr idc idd ide idi idr ie- iec ied iee iei ier iic iid iie iii iir ir- irc ird ire iri irr rcc rcd rce rci rcr rdc rdd rde rdi rdr re- rec red ree rei rer ric rid rie rii rir rrc rrd rri rrr