uncup nucup ucnup cunup ncuup cnuup unucp nuucp uuncp uuncp nuucp unucp ucunp cuunp uucnp uucnp cuunp ucunp ncuup cnuup nucup uncup cunup ucnup uncpu nucpu ucnpu cunpu ncupu cnupu unpcu nupcu upncu puncu npucu pnucu ucpnu cupnu upcnu pucnu cpunu pcunu ncpuu cnpuu npcuu pncuu cpnuu pcnuu unupc nuupc uunpc uunpc nuupc unupc unpuc nupuc upnuc punuc npuuc pnuuc uupnc uupnc upunc puunc upunc puunc nupuc unpuc npuuc pnuuc upnuc punuc ucupn cuupn uucpn uucpn cuupn ucupn ucpun cupun upcun pucun cpuun pcuun uupcn uupcn upucn puucn upucn puucn cupun ucpun cpuun pcuun upcun pucun ncupu cnupu nucpu uncpu cunpu ucnpu ncpuu cnpuu npcuu pncuu cpnuu pcnuu nupcu unpcu npucu pnucu upncu puncu cupnu ucpnu cpunu pcunu upcnu pucnu
Note: these 'words' (valid or invalid) are all the permutations of the word uncup. These words are obtained by scrambling the letters in uncup.