-er -ic c-- ccc ccd cce cci cco ccr cdc cdd cde cdi cdo cdr ce- cec ced cee cei ceo cer ci- cic cid cie cii cio cir co- coc cod coe coi coo cor crc crd cre cri cro crr dcc dcd dce dci dco dcr ddc ddd dde ddi ddo ddr de- dec ded dee dei deo der di- dic did die dii dio dir doc dod doe doi doo dor drc drd dre dri dro drr ec- ecc ecd ece eci eco ecr ed- edc edd ede edi edo edr eec eed eee eeo eer eic eid eie eii eio eir eo- eoc eod eoe eoi eoo eor erc erd ere eri ero err i-d icc icd ice ici ico icr idc idd ide idi ido idr ie- iec ied iee iei ier iic iid iie iii iio iir io- ioc iod ioe ioi ioo ior ir- irc ird ire iri iro irr o-i oc- occ ocd oci oco ocr odc odd ode odi odo odr oec oed oee oei oeo oer oic oid oie oii oio oir oo- ooc ood ooi ooo oor or- orc ord ore ori oro orr rcc rcd rce rci rco rcr rdc rdd rde rdi rdo rdr re- rec red ree rei reo rer ric rid rie rii rio rir roc rod roe roi roo ror rrc rrd rri rrr