-er c-- ccc cce cch cck ccr ccx ce- cec cee ceh cek cer cex ch- chc che chh chk chr chx ckc ckh ckx crc cre crh crk crr crx cxc cxh cxk cxr cxx ec- ecc ece ech eck ecr ecx eec eee eek eer eex ehc ehe ehh ehr ekc eke ekh ekr erc ere erh erk err ex- exc exe exh exr exx hcc hce hch hck hcr he- hec hee heh hek her hex hhc hhe hhh hhk hhr hkh hkk hkr hr- hrc hre hrh hrk hrr hxc kcc kce kch kck kcr kcx ke- kec kee keh kek ker kex khe khh khk khr kkc kke kkh kkk kkr krc krk krr rcc rce rch rcr rcx re- rec ree reh rek rer rex rh- rhc rhe rhh rhr rkc rke rkk rrc rrh rrk rrr rxr xch xcr xcx xee xer xex xke xrc xrx xxx