whiff hwiff wihff iwhff hiwff ihwff whfif hwfif wfhif fwhif hfwif fhwif wifhf iwfhf wfihf fwihf ifwhf fiwhf hifwf ihfwf hfiwf fhiwf ifhwf fihwf whiff hwiff wihff iwhff hiwff ihwff whfif hwfif wfhif fwhif hfwif fhwif wifhf iwfhf wfihf fwihf ifwhf fiwhf hifwf ihfwf hfiwf fhiwf ifhwf fihwf whffi hwffi wfhfi fwhfi hfwfi fhwfi whffi hwffi wfhfi fwhfi hfwfi fhwfi wffhi fwfhi wffhi fwfhi ffwhi ffwhi hffwi fhfwi hffwi fhfwi ffhwi ffhwi wiffh iwffh wfifh fwifh ifwfh fiwfh wiffh iwffh wfifh fwifh ifwfh fiwfh wffih fwfih wffih fwfih ffwih ffwih iffwh fifwh iffwh fifwh ffiwh ffiwh hiffw ihffw hfifw fhifw ifhfw fihfw hiffw ihffw hfifw fhifw ifhfw fihfw hffiw fhfiw hffiw fhfiw ffhiw ffhiw iffhw fifhw iffhw fifhw ffihw ffihw
Note: these 'words' (valid or invalid) are all the permutations of the word whiff. These words are obtained by scrambling the letters in whiff.