howll ohwll hwoll wholl owhll wohll holwl ohlwl hlowl lhowl olhwl lohwl hwlol whlol hlwol lhwol wlhol lwhol owlhl wolhl olwhl lowhl wlohl lwohl howll ohwll hwoll wholl owhll wohll holwl ohlwl hlowl lhowl olhwl lohwl hwlol whlol hlwol lhwol wlhol lwhol owlhl wolhl olwhl lowhl wlohl lwohl hollw ohllw hlolw lholw olhlw lohlw hollw ohllw hlolw lholw olhlw lohlw hllow lhlow hllow lhlow llhow llhow ollhw lolhw ollhw lolhw llohw llohw hwllo whllo hlwlo lhwlo wlhlo lwhlo hwllo whllo hlwlo lhwlo wlhlo lwhlo hllwo lhlwo hllwo lhlwo llhwo llhwo wllho lwlho wllho lwlho llwho llwho owllh wollh olwlh lowlh wlolh lwolh owllh wollh olwlh lowlh wlolh lwolh ollwh lolwh ollwh lolwh llowh llowh wlloh lwloh wlloh lwloh llwoh llwoh
Note: these 'words' (valid or invalid) are all the permutations of the word howll. These words are obtained by scrambling the letters in howll.