cccc cccs ccee ccrc ccre ccrs ccss cec- cece cecs ceec cees cer- cerc cere cers cesc cese cesr cess cexe crcc crce crcr cre- crec cree cres crex crss cscc csce cscr cscs csec csee cser csrc csrs csse cssr cxxx eccc ecce eces ecrc ecrr ecsc ecse ecss eecs eeee eees eerc eers eese er-x ercc erce erec erer eres errc erre errs erse esce escr escs esee eser eses esse exec exer exes exrx rccc rccs rcsc rcss recc rece recr recs rees rere rers rese ress rexx rrrr rscc rscs rsee rsre rxes sccc scce sccs scec scee scer scr- scrc scre scrs scsc scsr se-c se-e se-s se-x sec- secc sece secr secs seec seer sees seex serc sere serr sers sesc sese sess sex- sexe srcc srec sres sscc ssce sscs ssec ssee sses ssex ssrc ssrs sssc ssss xces xeer xer- xers xexe xxxx