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