whoof hwoof wohof owhof howof ohwof whoof hwoof wohof owhof howof ohwof woohf owohf woohf owohf oowhf oowhf hoowf ohowf hoowf ohowf oohwf oohwf whofo hwofo wohfo owhfo howfo ohwfo whfoo hwfoo wfhoo fwhoo hfwoo fhwoo wofho owfho wfoho fwoho ofwho fowho hofwo ohfwo hfowo fhowo ofhwo fohwo whofo hwofo wohfo owhfo howfo ohwfo whfoo hwfoo wfhoo fwhoo hfwoo fhwoo wofho owfho wfoho fwoho ofwho fowho hofwo ohfwo hfowo fhowo ofhwo fohwo woofh owofh woofh owofh oowfh oowfh wofoh owfoh wfooh fwooh ofwoh fowoh wofoh owfoh wfooh fwooh ofwoh fowoh oofwh oofwh ofowh foowh ofowh foowh hoofw ohofw hoofw ohofw oohfw oohfw hofow ohfow hfoow fhoow ofhow fohow hofow ohfow hfoow fhoow ofhow fohow oofhw oofhw ofohw foohw ofohw foohw
Note: these 'words' (valid or invalid) are all the permutations of the word whoof. These words are obtained by scrambling the letters in whoof.