c-one ccccc ceco- cecon cecxg ceene cegge cegne cence cenex ceno- cenon ceoce cnngo cnnnn co-co cocc- cocce cocco coceo cocon coen- cogen cogne cogon con-g conco conex conge congo conne cono- conon cooee coone coxen coxon e-one eccen econo eeeee eence egene egeon eggen eggng eggon egone encge encog eneco enego engen enone excon execx exene exxon gecco gegge genco genex genge gengo geno- geong go-go go-on go-oo gocco gocoo gogen gogne gogon gonc gonce gonen gongo gonne gonnn gonno gono- googe goone goong necco neece negon nengo nenno nexen nexoe nexon ngege ngong nnooo no-go no-no nonce nonne nonno noone noxon oceno ocoee oeco- oeno- oenoe ogene ognen ognon ogogo ogone oncee onco- one-x onene oneno oneon ongee ongon onne- onnen onone onoon onxeo ooooo x-one xeno- xenon xexex xonox xoxox