c-- ccc cce cch cck cco ccs ce- cec cee ceh cek ceo ces ch- chc che chh chk cho chs ckc ckh cko cks co- coc coe coh cok coo cos csc cse csh csk cso css ec- ecc ece ech eck eco ecs eec eee eek eeo ees ehc ehe ehh eho ehs ekc eke ekh eko eks eo- eoc eoe eoh eok eoo eos es- esc ese esh esk eso ess hcc hce hch hck hco hcs he- hec hee heh hek heo hes hhc hhe hhh hhk hho hhs hkh hkk hko hks hoc hoe hoh hok hoo hos hsc hse hsh hsk hss kcc kce kch kck kcs ke- kec kee keh kek keo kes khe khh khk kho khs kkc kke kkh kkk kks koc koe koh kok koo kos ksc kse ksh ksk kso kss oc- occ och ock oco ocs oec oee oeh oeo oes ohc ohe ohh oho ohs okc oke okk oko oks oo- ooc ooh ook ooo oos os- osc ose osh osk oso oss scc sce sch sck sco scs se- sec see seh sek seo ses sh- shc she shh shk sho shs sk- skc ske skh skk sko sks soc soe soh sok soo sos ss- ssc sse ssh ssk sso sss