-ene -one cccc ccee ccnc ccne ccnr ccoc ccrc ccre cec- cece ceco ceec cen- cene ceno ceor cer- cerc cere cern cero cexe cnco cnex cnrc cnrr coce coco coen coex con- conc cone conn cono coon cor- corc core corn coro corr coxe crcc crce crcr cre- crec cree cren creo crex crne croc croe cron croo cror cxro cxxx eccc ecce ecco ecne eco- econ ecrc ecrr eeee eeoc eerc eero ence enco enee eneo ener ennc enne eno- enoc enoe enon eone eore er-x ercc erce erec eren erer erne erno eroc eroe eron eroo errc erre erro exco exec exen exer exo- exon exor exrx nccc nccn nccr ncec ncee ncen ncer ncnc ncoc ncor ncrc ncre necc nece neco necr neen neer nene neno neo- neoc neon neoo neox nerc nere nero nerr nexe nexo nexx nnnn noce noco noer non- none nonn nono nonx noo- noon nooo noor nor- norc nore norn noro norr nren nroc nron nrrc o-eo occc occn oce ocee ocon ocre ocro ocrr oec- oecc oeec oen- oeno oere onc- once onco one- onec onee oneo oner onex onne onno onon onor oocr ooer oone oooo oore orce orco ore- orec oren oreo orer orex ornc orne orno oro- oroe oron oror orro oxen oxer oxo- oxon oxox oxxo rccc rcnr rcon recc rece recr reen rene renn reno rere rero rexx rnco rocc roce roco roen roer ronc rone rono roon roor roox rorc rore roro roxo rrrr xcon xeer xen- xene xenn xeno xeon xer- xero xexe xnee xoco xorn xoro xoxo xxxo xxxx