urent ruent uernt eurnt reunt erunt urnet runet unret nuret rnuet nruet uenrt eunrt unert nuert enurt neurt renut ernut rneut nreut enrut nerut uretn ruetn uertn eurtn reutn erutn urten ruten utren turen rtuen truen uetrn eutrn utern tuern eturn teurn retun ertun rteun treun etrun terun urnte runte unrte nurte rnute nrute urtne rutne utrne turne rtune trune untre nutre utnre tunre nture tnure rntue nrtue rtnue trnue ntrue tnrue uentr euntr unetr nuetr enutr neutr uetnr eutnr utenr tuenr etunr teunr unter nuter utner tuner ntuer tnuer entur netur etnur tenur nteur tneur rentu erntu rnetu nretu enrtu nertu retnu ertnu rtenu trenu etrnu ternu rnteu nrteu rtneu trneu ntreu tnreu entru netru etnru tenru nteru tneru
Note: these 'words' (valid or invalid) are all the permutations of the word urent. These words are obtained by scrambling the letters in urent.