durry udrry drury rdury urdry rudry durry udrry drury rdury urdry rudry drruy rdruy drruy rdruy rrduy rrduy urrdy rurdy urrdy rurdy rrudy rrudy duryr udryr druyr rduyr urdyr rudyr duyrr udyrr dyurr ydurr uydrr yudrr dryur rdyur dyrur ydrur rydur yrdur urydr ruydr uyrdr yurdr ryudr yrudr duryr udryr druyr rduyr urdyr rudyr duyrr udyrr dyurr ydurr uydrr yudrr dryur rdyur dyrur ydrur rydur yrdur urydr ruydr uyrdr yurdr ryudr yrudr drryu rdryu drryu rdryu rrdyu rrdyu dryru rdyru dyrru ydrru rydru yrdru dryru rdyru dyrru ydrru rydru yrdru rrydu rrydu ryrdu yrrdu ryrdu yrrdu urryd ruryd urryd ruryd rruyd rruyd uryrd ruyrd uyrrd yurrd ryurd yrurd uryrd ruyrd uyrrd yurrd ryurd yrurd rryud rryud ryrud yrrud ryrud yrrud
Note: these 'words' (valid or invalid) are all the permutations of the word durry. These words are obtained by scrambling the letters in durry.