cccc cccs cccu ccee ccss ccuc ccus cec- cece cecs ceec cees cesc cese cess ceux cexe cscc csce cscs csec csee csse csus cucc cuce cues cuss cusu cxxx eccc ecce eces ecsc ecse ecss ecsu ecus eecs eeee eees eese esce escs escu esee eses esse essu esus euse exec exes sccc scce sccs scec scee scsc scsu se-c se-e se-s se-u se-x sec- secc sece secs secu seec sees seeu seex sesc sese sess seux sex- sexe sscc ssce sscs ssec ssee sses ssex sssc ssss suc- succ sucs suee sues sueu sus- suse suss susu suus sux- suxe uces ucsc ucsu uess uscc usce uscs usee uses ussc usse usss ussu usus uuuu uxue uxus xces xeus xexe xuxu xxxx