hippo ihppo hpipo phipo iphpo pihpo hippo ihppo hpipo phipo iphpo pihpo hppio phpio hppio phpio pphio pphio ippho pipho ippho pipho ppiho ppiho hipop ihpop hpiop phiop iphop pihop hiopp ihopp hoipp ohipp iohpp oihpp hpoip phoip hopip ohpip pohip ophip ipohp piohp iophp oiphp poihp opihp hipop ihpop hpiop phiop iphop pihop hiopp ihopp hoipp ohipp iohpp oihpp hpoip phoip hopip ohpip pohip ophip ipohp piohp iophp oiphp poihp opihp hppoi phpoi hppoi phpoi pphoi pphoi hpopi phopi hoppi ohppi pohpi ophpi hpopi phopi hoppi ohppi pohpi ophpi ppohi ppohi pophi opphi pophi opphi ippoh pipoh ippoh pipoh ppioh ppioh ipoph pioph iopph oipph poiph opiph ipoph pioph iopph oipph poiph opiph ppoih ppoih popih oppih popih oppih
Note: these 'words' (valid or invalid) are all the permutations of the word hippo. These words are obtained by scrambling the letters in hippo.