-ene -one eeee eevn en-v enee eneo enne eno- enoe enon enp- eone epee epen epon epox eppo eppp epxp even evex evoe evon evoo evop exen exo- exon expn expo neen neep neev nene neno neo- neon neoo neox nepe neve nevo nexe nexo nexx nnnn non- none nonn nono nonx noo- noon nooo noop noov nope nov- nove novo npov o-eo oen- oeno oevp one- onee oneo onep onex onne onno onon oone oooo open opep opex opo- opon oppo ovee oven ovo- ovon ovoo ovpp oxen oxep oxo- oxon oxox oxxo peen peep peev pen- pene penn peno peon pepe pepo pnon pnpo pnpp pone pono ponp poon poop pop- pope popo popp povo ppen pppn pppo pppp veen veep ven- vene venn veno vepe veve vevo vexx vone vonn voxx vpon vvvv xen- xene xenn xeno xeon xexe xnee xove xoxo xxxo xxxv xxxx