natht antht ntaht tnaht atnht tanht nahtt anhtt nhatt hnatt ahntt hantt nthat tnhat nhtat hntat thnat htnat athnt tahnt ahtnt hatnt thant htant natth antth ntath tnath atnth tanth natth antth ntath tnath atnth tanth nttah tntah nttah tntah ttnah ttnah attnh tatnh attnh tatnh ttanh ttanh nahtt anhtt nhatt hnatt ahntt hantt natht antht ntaht tnaht atnht tanht nhtat hntat nthat tnhat htnat thnat ahtnt hatnt athnt tahnt htant thant nthta tnhta nhtta hntta thnta htnta nttha tntha nttha tntha ttnha ttnha nhtta hntta nthta tnhta htnta thnta thtna httna tthna tthna httna thtna athtn tahtn ahttn hattn thatn htatn atthn tathn atthn tathn ttahn ttahn ahttn hattn athtn tahtn htatn thatn thtan httan tthan tthan httan thtan
Note: these 'words' (valid or invalid) are all the permutations of the word natht. These words are obtained by scrambling the letters in natht.