hoofs ohofs hoofs ohofs oohfs oohfs hofos ohfos hfoos fhoos ofhos fohos hofos ohfos hfoos fhoos ofhos fohos oofhs oofhs ofohs foohs ofohs foohs hoosf ohosf hoosf ohosf oohsf oohsf hosof ohsof hsoof shoof oshof sohof hosof ohsof hsoof shoof oshof sohof ooshf ooshf osohf soohf osohf soohf hofso ohfso hfoso fhoso ofhso fohso hosfo ohsfo hsofo shofo oshfo sohfo hfsoo fhsoo hsfoo shfoo fshoo sfhoo ofsho fosho osfho sofho fsoho sfoho hofso ohfso hfoso fhoso ofhso fohso hosfo ohsfo hsofo shofo oshfo sohfo hfsoo fhsoo hsfoo shfoo fshoo sfhoo ofsho fosho osfho sofho fsoho sfoho oofsh oofsh ofosh foosh ofosh foosh oosfh oosfh osofh soofh osofh soofh ofsoh fosoh osfoh sofoh fsooh sfooh ofsoh fosoh osfoh sofoh fsooh sfooh
Note: these 'words' (valid or invalid) are all the permutations of the word hoofs. These words are obtained by scrambling the letters in hoofs.