-er -ic c-- ccc ccd cce ccf cci cck cco ccr cdc cdd cde cdf cdi cdk cdo cdr ce- cec ced cee cef cei cek ceo cer cfc cfd cfe cff cfi cfk cfo cfr ci- cic cid cie cif cii cik cio cir ckc ckd cki cko co- coc cod coe cof coi cok coo cor crc crd cre crf cri crk cro crr dcc dcd dce dcf dci dck dco dcr ddc ddd dde ddf ddi ddk ddo ddr de- dec ded dee def dei dek deo der dfc dfd dfe dff dfi dfk dfo dfr di- dic did die dif dii dik dio dir dkc dke dki dkk dko dkr doc dod doe dof doi dok doo dor drc drd dre dri drk dro drr ec- ecc ecd ece ecf eci eck eco ecr ed- edc edd ede edf edi edk edo edr eec eed eee eef eek eeo eer ef- efc efd efe eff efi efo efr eic eid eie eif eii eik eio eir ekc ekd eke ekf eki eko ekr eo- eoc eod eoe eof eoi eok eoo eor erc erd ere erf eri erk ero err fcc fcd fce fcf fci fck fco fcr fdc fdd fde fdf fdi fdk fdo fdr fec fed fee fef fei fek feo fer ffc ffd ffe fff ffi ffk ffo ffr fic fid fie fif fii fik fir fkc fkf fki fkk foc foe fof foi fok foo for frc frd fre frf fri frk fro frr i-d i-f icc icd ice icf ici ick ico icr idc idd ide idf idi idk ido idr ie- iec ied iee ief iei iek ier ifc ifd ife iff ifi ifo ifr iic iid iie iif iii iio iir ikc ike ikf iki ikk iko ikr io- ioc iod ioe iof ioi ioo ior ir- irc ird ire irf iri irk iro irr kcc kcd kce kci kck kcr kdc kde kdf kdk kdo kdr ke- kec ked kee kef kei kek keo ker kfc kfd kff kfi kfo kic kid kie kif kii kik kio kir kkc kke kki kkk kkr koc kod koe kof koi kok koo kor krc krd krf kri krk kro krr o-i oc- occ ocd ocf oci ock oco ocr odc odd ode odf odi odo odr oec oed oee oef oei oeo oer of- ofc ofd ofe off ofi ofo ofr oic oid oie oif oii oik oio oir okc okd oke oki okk oko okr oo- ooc ood oof ooi ook ooo oor or- orc ord ore orf ori ork oro orr rcc rcd rce rcf rci rco rcr rdc rdd rde rdf rdi rdo rdr re- rec red ree ref rei rek reo rer rfc rfd rfe rff rfi rfk rfo rfr ric rid rie rif rii rik rio rir rkc rke rkf rkk rko roc rod roe rof roi rok roo ror rrc rrd rrf rri rrk rrr