fitwh iftwh ftiwh tfiwh itfwh tifwh fiwth ifwth fwith wfith iwfth wifth ftwih tfwih fwtih wftih twfih wtfih itwfh tiwfh iwtfh witfh twifh wtifh fithw ifthw ftihw tfihw itfhw tifhw fihtw ifhtw fhitw hfitw ihftw hiftw fthiw tfhiw fhtiw hftiw thfiw htfiw ithfw tihfw ihtfw hitfw thifw htifw fiwht ifwht fwiht wfiht iwfht wifht fihwt ifhwt fhiwt hfiwt ihfwt hifwt fwhit wfhit fhwit hfwit whfit hwfit iwhft wihft ihwft hiwft whift hwift ftwhi tfwhi fwthi wfthi twfhi wtfhi fthwi tfhwi fhtwi hftwi thfwi htfwi fwhti wfhti fhwti hfwti whfti hwfti twhfi wthfi thwfi htwfi whtfi hwtfi itwhf tiwhf iwthf withf twihf wtihf ithwf tihwf ihtwf hitwf thiwf htiwf iwhtf wihtf ihwtf hiwtf whitf hwitf twhif wthif thwif htwif whtif hwtif
Note: these 'words' (valid or invalid) are all the permutations of the word fitwh. These words are obtained by scrambling the letters in fitwh.