-ene c-cd cccc cccf ccdc ccdf ccdn cced ccee ccfc ccfd ccff ccnc ccne ccnf cd-e cdec cdef cdfe cdnc cdnf cec- cece cedd cede ceec cef- cefc cefn cen- cend cene cfcf cfcn cndd dccc dcfc dddd dec- decc decd dece dedd dede deed deef deen defe deff defn dene denn dfcc dnce eccc ecce ecdc ecdf eced ecef ecfc ecne eddc edde ede- eden eede eeee eefe eefn eend efen ence end- ende ened enee ennc enne fccf fece fede fedn feed feen fefc fefe feff fend fene fenn ffcc ffee ffff fndd fndn nccc nccf nccn ncdc ncdn ncec nced ncee ncef ncen ncfc ncfe ncnc ncnd ndcc ndde necc nece nedc nedd nede need neef neen nefd nefe neff nend nene nfdc nfff nnnn