educu deucu eudcu uedcu duecu udecu edcuu decuu ecduu ceduu dceuu cdeuu eucdu uecdu ecudu ceudu ucedu cuedu duceu udceu dcueu cdueu ucdeu cudeu eduuc deuuc euduc ueduc dueuc udeuc eduuc deuuc euduc ueduc dueuc udeuc euudc ueudc euudc ueudc uuedc uuedc duuec uduec duuec uduec uudec uudec edcuu decuu ecduu ceduu dceuu cdeuu educu deucu eudcu uedcu duecu udecu ecudu ceudu eucdu uecdu cuedu ucedu dcueu cdueu duceu udceu cudeu ucdeu eucud uecud ecuud ceuud uceud cueud euucd ueucd euucd ueucd uuecd uuecd ecuud ceuud eucud uecud cueud uceud ucued cuued uuced uuced cuued ucued ducue udcue dcuue cduue ucdue cudue duuce uduce duuce uduce uudce uudce dcuue cduue ducue udcue cudue ucdue ucude cuude uucde uucde cuude ucude
Note: these 'words' (valid or invalid) are all the permutations of the word educu. These words are obtained by scrambling the letters in educu.