userl suerl uesrl eusrl seurl esurl usrel surel ursel rusel sruel rsuel uersl eursl uresl ruesl erusl reusl serul esrul sreul rseul ersul resul uselr suelr ueslr euslr seulr esulr usler suler ulser luser sluer lsuer uelsr eulsr ulesr luesr elusr leusr selur eslur sleur lseur elsur lesur usrle surle ursle rusle srule rsule uslre sulre ulsre lusre slure lsure urlse rulse ulrse lurse rluse lruse srlue rslue slrue lsrue rlsue lrsue uerls eurls urels ruels eruls reuls uelrs eulrs ulers luers elurs leurs urles rules ulres lures rlues lrues erlus relus elrus lerus rleus lreus serlu esrlu srelu rselu erslu reslu selru eslru sleru lseru elsru lesru srleu rsleu slreu lsreu rlseu lrseu erlsu relsu elrsu lersu rlesu lresu
Note: these 'words' (valid or invalid) are all the permutations of the word userl. These words are obtained by scrambling the letters in userl.