hards ahrds hrads rhads arhds rahds hadrs ahdrs hdars dhars adhrs dahrs hrdas rhdas hdras dhras rdhas drhas ardhs radhs adrhs darhs rdahs drahs harsd ahrsd hrasd rhasd arhsd rahsd hasrd ahsrd hsard shard ashrd sahrd hrsad rhsad hsrad shrad rshad srhad arshd rashd asrhd sarhd rsahd srahd hadsr ahdsr hdasr dhasr adhsr dahsr hasdr ahsdr hsadr shadr ashdr sahdr hdsar dhsar hsdar shdar dshar sdhar adshr dashr asdhr sadhr dsahr sdahr hrdsa rhdsa hdrsa dhrsa rdhsa drhsa hrsda rhsda hsrda shrda rshda srhda hdsra dhsra hsdra shdra dshra sdhra rdsha drsha rsdha srdha dsrha sdrha ardsh radsh adrsh darsh rdash drash arsdh rasdh asrdh sardh rsadh sradh adsrh dasrh asdrh sadrh dsarh sdarh rdsah drsah rsdah srdah dsrah sdrah
Note: these 'words' (valid or invalid) are all the permutations of the word hards. These words are obtained by scrambling the letters in hards.