-ene -one eeee eefe eefn efen efeo efon enee eneo enfp enne eno- enoe enon enp- eone epee epen epon epox eppo eppp epxp exen exfo exo- exon expn expo feen fefe feff fefo fene fenn feof feon ffee ffff fofo fone fono foof foon fopp foxe foxx neef neen neep nefe neff nene neno neo- neon neoo neox nepe nexe nexo nexx nfff nfon nnnn nofx non- none nonn nono nonx noo- noon nooo noop nope o-eo oen- oeno ofen off- offe offo ofno one- onee oneo onep onex onne onno onon ooff oone oooo open opep opex opo- opon oppo oxen oxep oxo- oxof oxon oxox oxxo peen peep peff pen- pene penn peno peon pepe pepo pfff pnon pnpo pnpp poff pone pono ponp poof poon poop pop- pope popo popp ppen pppn pppo pppp xefe xen- xene xenn xeno xeon xexe xnee xoxo xxxo xxxx