cccc cccs ccee ccss ccst cctc cctt cec- cece cecs cect ceec cees cesc cese cess cest cet- cete cets cscc csce cscs csec csee cset csse cstc csts ctec ctsc ctss ctts eccc ecce ecct eces ecsc ecse ecss ect- ectc eecs eeee eees eese eetc eete eets esce escs esee eses eset esse esst estc este ests etcc etcs etec etee etes ette sccc scce sccs scct scec scee scet scsc scst sctc scts se-c se-e se-s se-t sec- secc sece secs sect seec sees seet sesc sese sess sest set- setc sete sets sett sscc ssce sscs ssec ssee sses sset sssc ssss sstc ssts stcc stcs stec stee stes stet stss sttc tccc tctc tcts tecs tect teec tees teet tesc tese tess test tete tets tett tscc tsec tses tset tsse tsst tstc tsts ttss tttt