-er -ic c-- ccc ccd cce ccf cci ccr cdc cdd cde cdf cdi cdr ce- cec ced cee cef cei cer cfc cfd cfe cff cfi cfr ci- cic cid cie cif cii cir crc crd cre crf cri crr dcc dcd dce dcf dci dcr ddc ddd dde ddf ddi ddr de- dec ded dee def dei der dfc dfd dfe dff dfi dfr di- dic did die dif dii dir drc drd dre dri drr ec- ecc ecd ece ecf eci ecr ed- edc edd ede edf edi edr eec eed eee eef eer ef- efc efd efe eff efi efr eic eid eie eif eii eir erc erd ere erf eri err fcc fcd fce fcf fci fcr fdc fdd fde fdf fdi fdr fec fed fee fef fei fer ffc ffd ffe fff ffi ffr fic fid fie fif fii fir frc frd fre frf fri frr i-d i-f icc icd ice icf ici icr idc idd ide idf idi idr ie- iec ied iee ief iei ier ifc ifd ife iff ifi ifr iic iid iie iif iii iir ir- irc ird ire irf iri irr rcc rcd rce rcf rci rcr rdc rdd rde rdf rdi rdr re- rec red ree ref rei rer rfc rfd rfe rff rfi rfr ric rid rie rif rii rir rrc rrd rrf rri rrr