-er -ic c-- ccc ccd cce cci cck ccr cdc cdd cde cdi cdk cdr ce- cec ced cee cei cek cer ci- cic cid cie cii cik cir ckc ckd cki crc crd cre cri crk crr dcc dcd dce dci dck dcr ddc ddd dde ddi ddk ddr de- dec ded dee dei dek der di- dic did die dii dik dir dkc dke dki dkk dkr drc drd dre dri drk drr ec- ecc ecd ece eci eck ecr ed- edc edd ede edi edk edr eec eed eee eek eer eic eid eie eii eik eir ekc ekd eke eki ekr erc erd ere eri erk err i-d icc icd ice ici ick icr idc idd ide idi idk idr ie- iec ied iee iei iek ier iic iid iie iii iir ikc ike iki ikk ikr ir- irc ird ire iri irk irr kcc kcd kce kci kck kcr kdc kde kdk kdr ke- kec ked kee kei kek ker kic kid kie kii kik kir kkc kke kki kkk kkr krc krd kri krk krr rcc rcd rce rci rcr rdc rdd rde rdi rdr re- rec red ree rei rek rer ric rid rie rii rik rir rkc rke rkk rrc rrd rri rrk rrr