ovpen vopen opven poven vpoen pvoen ovepn voepn oevpn eovpn veopn evopn opevn poevn oepvn eopvn peovn epovn vpeon pveon vepon evpon pevon epvon ovpne vopne opvne povne vpone pvone ovnpe vonpe onvpe novpe vnope nvope opnve ponve onpve nopve pnove npove vpnoe pvnoe vnpoe nvpoe pnvoe npvoe ovenp voenp oevnp eovnp veonp evonp ovnep vonep onvep novep vnoep nvoep oenvp eonvp onevp noevp enovp neovp venop evnop vneop nveop envop nevop openv poenv oepnv eopnv peonv eponv opnev ponev onpev nopev pnoev npoev oenpv eonpv onepv noepv enopv neopv penov epnov pneov npeov enpov nepov vpeno pveno vepno evpno pevno epvno vpneo pvneo vnpeo nvpeo pnveo npveo venpo evnpo vnepo nvepo envpo nevpo penvo epnvo pnevo npevo enpvo nepvo
Note: these 'words' (valid or invalid) are all the permutations of the word ovpen. These words are obtained by scrambling the letters in ovpen.