tupek utpek tpuek ptuek uptek putek tuepk utepk teupk etupk uetpk eutpk tpeuk pteuk tepuk etpuk petuk eptuk upetk puetk ueptk euptk peutk eputk tupke utpke tpuke ptuke uptke putke tukpe utkpe tkupe ktupe uktpe kutpe tpkue ptkue tkpue ktpue pktue kptue upkte pukte ukpte kupte pkute kpute tuekp utekp teukp etukp uetkp eutkp tukep utkep tkuep ktuep uktep kutep tekup etkup tkeup kteup ektup ketup uektp euktp uketp kuetp ekutp keutp tpeku pteku tepku etpku petku eptku tpkeu ptkeu tkpeu ktpeu pkteu kpteu tekpu etkpu tkepu ktepu ektpu ketpu pektu epktu pketu kpetu ekptu keptu upekt puekt uepkt eupkt peukt epukt upket puket ukpet kupet pkuet kpuet uekpt eukpt ukept kuept ekupt keupt pekut epkut pkeut kpeut ekput keput
Note: these 'words' (valid or invalid) are all the permutations of the word tupek. These words are obtained by scrambling the letters in tupek.