c-- ccc cce cch cck ccs ccx ce- cec cee ceh cek ces cex ch- chc che chh chk chs chx ckc ckh cks ckx csc cse csh csk css csx cxc cxh cxk cxs cxx ec- ecc ece ech eck ecs ecx eec eee eek ees eex ehc ehe ehh ehs ekc eke ekh eks es- esc ese esh esk ess esx ex- exc exe exh exs exx hcc hce hch hck hcs he- hec hee heh hek hes hex hhc hhe hhh hhk hhs hkh hkk hks hsc hse hsh hsk hss hsx hxc kcc kce kch kck kcs kcx ke- kec kee keh kek kes kex khe khh khk khs kkc kke kkh kkk kks ksc kse ksh ksk kss scc sce sch sck scs scx se- sec see seh sek ses sex sh- shc she shh shk shs sk- skc ske skh skk sks skx ss- ssc sse ssh ssk sss ssx sxc sxs xch xcx xee xes xex xke xks xsc xss xxx