-er -ol c-- ccc ccd cce cck ccl cco ccr cdc cdd cde cdk cdl cdo cdr ce- cec ced cee cek cel ceo cer ckc ckd cko cl- clc cld cle clk cll clo clr co- coc cod coe cok col coo cor crc crd cre crk crl cro crr dcc dcd dce dck dcl dco dcr ddc ddd dde ddk ddl ddo ddr de- dec ded dee dek del deo der dkc dke dkk dkl dko dkr dl- dlc dld dle dlk dll dlo dlr doc dod doe dok dol doo dor drc drd dre drk drl dro drr ec- ecc ecd ece eck ecl eco ecr ed- edc edd ede edk edl edo edr eec eed eee eek eel eeo eer ekc ekd eke ekl eko ekr elc eld ele elk ell elo elr eo- eoc eod eoe eok eol eoo eor erc erd ere erk erl ero err kcc kcd kce kck kcl kcr kdc kde kdk kdl kdo kdr ke- kec ked kee kek kel keo ker kkc kke kkk kkl kkr kl- klc kld klo klr koc kod koe kok kol koo kor krc krd krk krl kro krr lcc lcd lce lck lcl lco lcr ldc ldd lde ldk ldl ldo ldr lec led lee lek lel leo ler lkl lkr llc lld lle llk lll llo llr loc lod loe lok lol loo lor lrc lrd lrk lro lrr oc- occ ocd ock ocl oco ocr odc odd ode odl odo odr oec oed oee oel oeo oer okc okd oke okk okl oko okr olc old ole olk oll olo oo- ooc ood ook ool ooo oor or- orc ord ore ork orl oro orr rcc rcd rce rcl rco rcr rdc rdd rde rdl rdo rdr re- rec red ree rek rel reo rer rkc rke rkk rko rlc rld rle rll rlo rlr roc rod roe rok rol roo ror rrc rrd rrk rrl rrr