rpeek preek repek erpek perek eprek rpeek preek repek erpek perek eprek reepk erepk reepk erepk eerpk eerpk peerk eperk peerk eperk eeprk eeprk rpeke preke repke erpke perke eprke rpkee prkee rkpee krpee pkree kpree rekpe erkpe rkepe krepe ekrpe kerpe pekre epkre pkere kpere ekpre kepre rpeke preke repke erpke perke eprke rpkee prkee rkpee krpee pkree kpree rekpe erkpe rkepe krepe ekrpe kerpe pekre epkre pkere kpere ekpre kepre reekp erekp reekp erekp eerkp eerkp rekep erkep rkeep kreep ekrep kerep rekep erkep rkeep kreep ekrep kerep eekrp eekrp ekerp keerp ekerp keerp peekr epekr peekr epekr eepkr eepkr peker epker pkeer kpeer ekper keper peker epker pkeer kpeer ekper keper eekpr eekpr ekepr keepr ekepr keepr
Note: these 'words' (valid or invalid) are all the permutations of the word rpeek. These words are obtained by scrambling the letters in rpeek.