-ene cccc cccs ccee ccnc ccne ccnr ccns ccrc ccre ccrs ccsn ccss cec- cece cecs ceec cees cen- cene cens cer- cerc cere cern cers cesc cese cesr cess cexe cnes cnex cnrc cnrr cnss crcc crce crcr cre- crec cree cren cres crex crne crns crss cscc csce cscr cscs csec csee cser csne csrc csrs csse cssr cxxx eccc ecce eces ecne ecrc ecrr ecsc ecse ecss eecs eeee eees eens eerc eers eese ence encs enee ener enes ennc enne enns enrs ense er-x ercc erce erec eren erer eres erne erns errc erre errs erse esce escr escs esee esen eser eses esne esse exec exen exer exes exrx nccc nccn nccr nccs ncec ncee ncen ncer nces ncnc ncrc ncre ncsc ncse ncss necc nece necr necs neen neer nees nene nens nerc nere nerr ners nesc nese nesn nesr ness nexe nexx nnes nnnn nnss nrcs nren nrrc nrsc nscc nscs nsec nser nsnr nsrc nssc nsse nssr nsss rccc rccs rcnr rcsc rcss recc rece recr recs reen rees rene renn rens rere rers rese resn ress rexx rncs rrrr rscc rscn rscs rsee rsnn rsnr rsre rxes sccc scce sccs scec scee scer scnr scr- scrc scre scrn scrs scsc scsn scsr se-c se-e se-n se-s se-x sec- secc sece secn secr secs seec seen seer sees seex sene senn senr sens serc sere sern serr sers sesc sese sess sex- sexe sncc snee sner snes snns snrs srcc srec sres srnn sscc ssce sscs ssec ssee sses ssex ssns ssrc ssrs sssc ssss xces xeer xen- xene xenn xer- xers xexe xnee xxxx