npocu pnocu nopcu onpcu poncu opncu npcou pncou ncpou cnpou pcnou cpnou nocpu oncpu ncopu cnopu ocnpu conpu pocnu opcnu pconu cponu ocpnu copnu npouc pnouc nopuc onpuc ponuc opnuc npuoc pnuoc nupoc unpoc punoc upnoc noupc onupc nuopc unopc ounpc uonpc pounc opunc puonc uponc oupnc uopnc npcuo pncuo ncpuo cnpuo pcnuo cpnuo npuco pnuco nupco unpco punco upnco ncupo cnupo nucpo uncpo cunpo ucnpo pcuno cpuno pucno upcno cupno ucpno nocup oncup ncoup cnoup ocnup conup noucp onucp nuocp unocp ouncp uoncp ncuop cnuop nucop uncop cunop ucnop ocunp counp oucnp uocnp cuonp uconp pocun opcun pcoun cpoun ocpun copun poucn opucn puocn upocn oupcn uopcn pcuon cpuon pucon upcon cupon ucpon ocupn coupn oucpn uocpn cuopn ucopn
Note: these 'words' (valid or invalid) are all the permutations of the word npocu. These words are obtained by scrambling the letters in npocu.