-er c-- ccc ccd cce cck cco ccr ccs ccv cdc cdd cde cdk cdo cdr cds cdv ce- cec ced cee cek ceo cer ces cev ckc ckd cko cks co- coc cod coe cok coo cor cos cov crc crd cre crk cro crr crs crv csc csd cse csk cso csr css csv cvc cvd cve cvk cvo cvr cvs cvv dcc dcd dce dck dco dcr dcs dcv ddc ddd dde ddk ddo ddr dds de- dec ded dee dek deo der des dev dkc dke dkk dko dkr dks doc dod doe dok doo dor dos dov drc drd dre drk dro drr drs drv dsc dsd dse dsk dso dsr dss dsv dvc dvd dve dvk dvr dvs ec- ecc ecd ece eck eco ecr ecs ecv ed- edc edd ede edk edo edr eds eec eed eee eek eeo eer ees eev ekc ekd eke eko ekr eks ekv eo- eoc eod eoe eok eoo eor eos erc erd ere erk ero err ers erv es- esc esd ese esk eso esr ess esv evc evd eve evo evr evs evv kcc kcd kce kck kcr kcs kdc kde kdk kdo kdr kds ke- kec ked kee kek keo ker kes kev kkc kke kkk kkr kks kkv koc kod koe kok koo kor kos krc krd krk kro krr krs krv ksc ksd kse ksk kso ksr kss ksv kvk kvo kvr kvs kvv oc- occ ocd ock oco ocr ocs ocv odc odd ode odo odr ods odv oec oed oee oeo oer oes okc okd oke okk oko okr oks oo- ooc ood ook ooo oor oos oov or- orc ord ore ork oro orr ors orv os- osc osd ose osk oso osr oss osv ov- ovc ovd ove ovo ovs ovv rcc rcd rce rco rcr rcs rcv rdc rdd rde rdo rdr rds rdv re- rec red ree rek reo rer res rev rkc rke rkk rko rks rkv roc rod roe rok roo ror ros rov rrc rrd rrk rrr rrs rsc rsd rse rsk rso rsr rss rsv rvc rvd rve rvo rvr rvs rvv scc scd sce sck sco scr scs scv sdc sdd sde sdk sdo sdr sds sdv se- sec sed see sek seo ser ses sev sk- skc skd ske skk sko skr sks soc sod soe sok soo sor sos sov sr- src srd sre srk sro srr srs srv ss- ssc ssd sse ssk sso ssr sss ssv svc svd sve svk svo svr svs svv v-e vcc vcd vce vco vcr vcs vdc vdd vde vdk vdo vdr vds vdv vec ved vee vek veo ver ves voc vod voe vok voo vor vos vov vrc vrd vre vrk vrr vrs vsc vsd vse vsk vso vsr vss vsv vvc vvo vvr vvs vvv