-er -ol c-- ccc ccd cce cck ccl cco ccr ccv cdc cdd cde cdk cdl cdo cdr cdv ce- cec ced cee cek cel ceo cer cev ckc ckd cko cl- clc cld cle clk cll clo clr clv co- coc cod coe cok col coo cor cov crc crd cre crk crl cro crr crv cvc cvd cve cvk cvl cvo cvr cvv dcc dcd dce dck dcl dco dcr dcv ddc ddd dde ddk ddl ddo ddr de- dec ded dee dek del deo der dev dkc dke dkk dkl dko dkr dl- dlc dld dle dlk dll dlo dlr dlv doc dod doe dok dol doo dor dov drc drd dre drk drl dro drr drv dvc dvd dve dvk dvl dvr ec- ecc ecd ece eck ecl eco ecr ecv ed- edc edd ede edk edl edo edr eec eed eee eek eel eeo eer eev ekc ekd eke ekl eko ekr ekv elc eld ele elk ell elo elr elv eo- eoc eod eoe eok eol eoo eor erc erd ere erk erl ero err erv evc evd eve evl evo evr evv kcc kcd kce kck kcl kcr kdc kde kdk kdl kdo kdr ke- kec ked kee kek kel keo ker kev kkc kke kkk kkl kkr kkv kl- klc kld klo klr klv koc kod koe kok kol koo kor krc krd krk krl kro krr krv kvk kvo kvr kvv lcc lcd lce lck lcl lco lcr lcv ldc ldd lde ldk ldl ldo ldr ldv lec led lee lek lel leo ler lev lkl lkr llc lld lle llk lll llo llr llv loc lod loe lok lol loo lor lov lrc lrd lrk lro lrr lrv lvc lvd lve lvl lvr lvv oc- occ ocd ock ocl oco ocr ocv odc odd ode odl odo odr odv 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 oov or- orc ord ore ork orl oro orr orv ov- ovc ovd ove ovl ovo ovv rcc rcd rce rcl rco rcr rcv rdc rdd rde rdl rdo rdr rdv re- rec red ree rek rel reo rer rev rkc rke rkk rko rkv rlc rld rle rll rlo rlr roc rod roe rok rol roo ror rov rrc rrd rrk rrl rrr rvc rvd rve rvl rvo rvr rvv v-e vcc vcd vce vcl vco vcr vdc vdd vde vdk vdl vdo vdr vdv vec ved vee vek vel veo ver vl- vlc vld vle vlk vll vlo vlv voc vod voe vok vol voo vor vov vrc vrd vre vrk vrr vvc vvo vvr vvv