c-- ccc cce cch cck cco ccv ce- cec cee ceh cek ceo cev ch- chc che chh chk cho chv ckc ckh cko co- coc coe coh cok coo cov cvc cve cvh cvk cvo cvv ec- ecc ece ech eck eco ecv eec eee eek eeo eev ehc ehe ehh eho ehv ekc eke ekh eko ekv eo- eoc eoe eoh eok eoo evc eve evh evo evv hcc hce hch hck hco hcv he- hec hee heh hek heo hev hhc hhe hhh hhk hho hhv hkh hkk hko hoc hoe hoh hok hoo hov hv- hvc hvk hvo hvv kcc kce kch kck ke- kec kee keh kek keo kev khe khh khk kho khv kkc kke kkh kkk kkv koc koe koh kok koo kvh kvk kvo kvv oc- occ och ock oco ocv oec oee oeh oeo ohc ohe ohh oho okc oke okk oko oo- ooc ooh ook ooo oov ov- ovc ove ovh ovo ovv v-e vcc vce vch vco vec vee veh vek veo vh- vhc vhe vho voc voe voh vok voo vov vvc vvo vvv