-ene -one cccc ccee ccgc ccnc ccne ccoc cec- cece ceco ceec cege cego cen- cene ceng ceno cexe cgcc cgcg cnco cnex coce coco coen coex cogo con- conc cone cong conn cono coon coxe cxxx eccc ecce ecco ecne eco- ecog econ eeee eeng eeoc egcc egcg egec egee egge eggo egne egnx ego- egon ence enco enee eneg eneo enge engg engo ennc enne eno- enoc enoe enon eone exco exec exen exge exo- exon gc-c gccc gece geen gege gegg gego gen- genc gene geng genn geno genx geo- geog geon geox gggg gncc gngc gnoo goce goen gogo gon- gone gong gonn gono goog goon nccc nccn ncec ncee ncen ncnc ncoc necc nece neco neen nege nego nene neng neno neo- neoc neon neoo neox nexe nexo nexx ngen ngon nngn nnnn noce noco nogg nogo non- none nong nonn nono nonx noo- noon nooo o-eo occc occn oce ocee ocon oec- oecc oeec oen- oeno ogee ogen ogge ogog ogon onc- once onco one- onec onee oneg oneo onex onge ongo onne onno onon oone oooo oxen oxo- oxon oxox oxxo xcon xen- xene xenn xeno xeon xexe xnee xoco xong xoxo xxxo xxxx