-er -ol c-- ccc ccd cce ccf cck ccl cco ccr cdc cdd cde cdf cdk cdl cdo cdr ce- cec ced cee cef cek cel ceo cer cfc cfd cfe cff cfk cfl cfo cfr ckc ckd cko cl- clc cld cle clf clk cll clo clr co- coc cod coe cof cok col coo cor crc crd cre crf crk crl cro crr dcc dcd dce dcf dck dcl dco dcr ddc ddd dde ddf ddk ddl ddo ddr de- dec ded dee def dek del deo der dfc dfd dfe dff dfk dfl dfo dfr dkc dke dkk dkl dko dkr dl- dlc dld dle dlf dlk dll dlo dlr doc dod doe dof dok dol doo dor drc drd dre drk drl dro drr ec- ecc ecd ece ecf eck ecl eco ecr ed- edc edd ede edf edk edl edo edr eec eed eee eef eek eel eeo eer ef- efc efd efe eff efl efo efr ekc ekd eke ekf ekl eko ekr elc eld ele elf elk ell elo elr eo- eoc eod eoe eof eok eol eoo eor erc erd ere erf erk erl ero err fcc fcd fce fcf fck fcl fco fcr fdc fdd fde fdf fdk fdl fdo fdr fec fed fee fef fek fel feo fer ffc ffd ffe fff ffk ffl ffo ffr fkc fkf fkk fkl flc fld fle flf fll flo flr foc foe fof fok fol foo for frc frd fre frf frk frl fro frr kcc kcd kce kck kcl kcr kdc kde kdf kdk kdl kdo kdr ke- kec ked kee kef kek kel keo ker kfc kfd kff kfo kkc kke kkk kkl kkr kl- klc kld klf klo klr koc kod koe kof kok kol koo kor krc krd krf krk krl kro krr lcc lcd lce lcf lck lcl lco lcr ldc ldd lde ldf ldk ldl ldo ldr lec led lee lef lek lel leo ler lfc lfd lfe lff lfk lfl lfo lfr lkl lkr llc lld lle llf llk lll llo llr loc lod loe lof lok lol loo lor lrc lrd lrf lrk lro lrr oc- occ ocd ocf ock ocl oco ocr odc odd ode odf odl odo odr oec oed oee oef oel oeo oer of- ofc ofd ofe off ofl ofo ofr okc okd oke okk okl oko okr olc old ole olf olk oll olo oo- ooc ood oof ook ool ooo oor or- orc ord ore orf ork orl oro orr rcc rcd rce rcf rcl rco rcr rdc rdd rde rdf rdl rdo rdr re- rec red ree ref rek rel reo rer rfc rfd rfe rff rfk rfl rfo rfr rkc rke rkf rkk rko rlc rld rle rlf rll rlo rlr roc rod roe rof rok rol roo ror rrc rrd rrf rrk rrl rrr