-er c-- ccc cce cch cck cco ccr ccv ce- cec cee ceh cek ceo cer cev ch- chc che chh chk cho chr chv ckc ckh cko co- coc coe coh cok coo cor cov crc cre crh crk cro crr crv cvc cve cvh cvk cvo cvr cvv ec- ecc ece ech eck eco ecr ecv eec eee eek eeo eer eev ehc ehe ehh eho ehr ehv ekc eke ekh eko ekr ekv eo- eoc eoe eoh eok eoo eor erc ere erh erk ero err erv evc eve evh evo evr evv hcc hce hch hck hco hcr hcv he- hec hee heh hek heo her hev hhc hhe hhh hhk hho hhr hhv hkh hkk hko hkr hoc hoe hoh hok hoo hor hov hr- hrc hre hrh hrk hro hrr hrv hv- hvc hvk hvo hvr hvv kcc kce kch kck kcr ke- kec kee keh kek keo ker kev khe khh khk kho khr khv kkc kke kkh kkk kkr kkv koc koe koh kok koo kor krc krk kro krr krv kvh kvk kvo kvr kvv oc- occ och ock oco ocr ocv oec oee oeh oeo oer ohc ohe ohh oho ohr okc oke okk oko okr oo- ooc ooh ook ooo oor oov or- orc ore orh ork oro orr orv ov- ovc ove ovh ovo ovv rcc rce rch rco rcr rcv re- rec ree reh rek reo rer rev rh- rhc rhe rhh rho rhr rhv rkc rke rkk rko rkv roc roe roh rok roo ror rov rrc rrh rrk rrr rvc rve rvh rvo rvr rvv v-e vcc vce vch vco vcr vec vee veh vek veo ver vh- vhc vhe vho voc voe voh vok voo vor vov vrc vre vrh vrk vrr vvc vvo vvr vvv