-er -ic c-- ccc ccd cce ccf cci cck ccr cdc cdd cde cdf cdi cdk cdr ce- cec ced cee cef cei cek cer cfc cfd cfe cff cfi cfk cfr ci- cic cid cie cif cii cik cir ckc ckd cki crc crd cre crf cri crk crr dcc dcd dce dcf dci dck dcr ddc ddd dde ddf ddi ddk ddr de- dec ded dee def dei dek der dfc dfd dfe dff dfi dfk dfr di- dic did die dif dii dik dir dkc dke dki dkk dkr drc drd dre dri drk drr ec- ecc ecd ece ecf eci eck ecr ed- edc edd ede edf edi edk edr eec eed eee eef eek eer ef- efc efd efe eff efi efr eic eid eie eif eii eik eir ekc ekd eke ekf eki ekr erc erd ere erf eri erk err fcc fcd fce fcf fci fck fcr fdc fdd fde fdf fdi fdk fdr fec fed fee fef fei fek fer ffc ffd ffe fff ffi ffk ffr fic fid fie fif fii fik fir fkc fkf fki fkk frc frd fre frf fri frk frr i-d i-f icc icd ice icf ici ick icr idc idd ide idf idi idk idr ie- iec ied iee ief iei iek ier ifc ifd ife iff ifi ifr iic iid iie iif iii iir ikc ike ikf iki ikk ikr ir- irc ird ire irf iri irk irr kcc kcd kce kci kck kcr kdc kde kdf kdk kdr ke- kec ked kee kef kei kek ker kfc kfd kff kfi kic kid kie kif kii kik kir kkc kke kki kkk kkr krc krd krf kri krk krr rcc rcd rce rcf rci rcr rdc rdd rde rdf rdi rdr re- rec red ree ref rei rek rer rfc rfd rfe rff rfi rfk rfr ric rid rie rif rii rik rir rkc rke rkf rkk rrc rrd rrf rri rrk rrr