pupil uppil ppuil ppuil uppil pupil puipl upipl piupl ipupl uippl iuppl ppiul ppiul pipul ippul pipul ippul upipl puipl uippl iuppl piupl ipupl pupli uppli ppuli ppuli uppli pupli pulpi uplpi plupi lpupi ulppi luppi pplui pplui plpui lppui plpui lppui uplpi pulpi ulppi luppi plupi lpupi puilp upilp piulp ipulp uiplp iuplp pulip uplip pluip lpuip ulpip lupip pilup iplup pliup lpiup ilpup lipup uilpp iulpp ulipp luipp ilupp liupp ppilu ppilu piplu ipplu piplu ipplu ppliu ppliu plpiu lppiu plpiu lppiu pilpu iplpu plipu lpipu ilppu lippu pilpu iplpu plipu lpipu ilppu lippu upilp puilp uiplp iuplp piulp ipulp uplip pulip ulpip lupip pluip lpuip uilpp iulpp ulipp luipp ilupp liupp pilup iplup pliup lpiup ilpup lipup
Note: these 'words' (valid or invalid) are all the permutations of the word pupil. These words are obtained by scrambling the letters in pupil.