hardy ahrdy hrady rhady arhdy rahdy hadry ahdry hdary dhary adhry dahry hrday rhday hdray dhray rdhay drhay ardhy radhy adrhy darhy rdahy drahy haryd ahryd hrayd rhayd arhyd rahyd hayrd ahyrd hyard yhard ayhrd yahrd hryad rhyad hyrad yhrad ryhad yrhad aryhd rayhd ayrhd yarhd ryahd yrahd hadyr ahdyr hdayr dhayr adhyr dahyr haydr ahydr hyadr yhadr ayhdr yahdr hdyar dhyar hydar yhdar dyhar ydhar adyhr dayhr aydhr yadhr dyahr ydahr hrdya rhdya hdrya dhrya rdhya drhya hryda rhyda hyrda yhrda ryhda yrhda hdyra dhyra hydra yhdra dyhra ydhra rdyha dryha rydha yrdha dyrha ydrha ardyh radyh adryh daryh rdayh drayh arydh raydh ayrdh yardh ryadh yradh adyrh dayrh aydrh yadrh dyarh ydarh rdyah dryah rydah yrdah dyrah ydrah
Note: these 'words' (valid or invalid) are all the permutations of the word hardy. These words are obtained by scrambling the letters in hardy.