-ene -one eeee eefe eefn efen efeo efon enee eneo enne ennu eno- enoe enon enue enuf eone eoux exen exfo exo- exon feen fefe feff fefo fene fenn feof feon feux ffee ffff ffun fnuf fofo fone fono foof foon foun foxe foxx fuff fufu fune funf funx neef neen nefe neff nene neno nenu neo- neon neoo neox neue neuf neun neuo neuu nexe nexo nexx nfff nfon nnnn nofx non- none nonn nono nonu nonx noo- noon nooo noun nuee nuff nufx nune nunn nuno nuon o-eo oen- oeno oeuf ofen off- offe offo offu ofno one- onee oneo onex onne onno onon onue ooff oone oooo ouen oufe ouff oun- oune ouu- oxen oxo- oxof oxon oxox oxuf oxxo ueno uffe unee unef unen unne unno unon unox uofo uone uuen uuno uuuu uxue xefe xen- xene xenn xeno xenu xeon xexe xnee xoxo xuxu xxxo xxxx