nurdy unrdy nrudy rnudy urndy rundy nudry undry ndury dnury udnry dunry nrduy rnduy ndruy dnruy rdnuy drnuy urdny rudny udrny durny rduny druny nuryd unryd nruyd rnuyd urnyd runyd nuyrd unyrd nyurd ynurd uynrd yunrd nryud rnyud nyrud ynrud rynud yrnud urynd ruynd uyrnd yurnd ryund yrund nudyr undyr nduyr dnuyr udnyr dunyr nuydr unydr nyudr ynudr uyndr yundr ndyur dnyur nydur yndur dynur ydnur udynr duynr uydnr yudnr dyunr ydunr nrdyu rndyu ndryu dnryu rdnyu drnyu nrydu rnydu nyrdu ynrdu ryndu yrndu ndyru dnyru nydru yndru dynru ydnru rdynu drynu rydnu yrdnu dyrnu ydrnu urdyn rudyn udryn duryn rduyn druyn urydn ruydn uyrdn yurdn ryudn yrudn udyrn duyrn uydrn yudrn dyurn ydurn rdyun dryun rydun yrdun dyrun ydrun
Note: these 'words' (valid or invalid) are all the permutations of the word nurdy. These words are obtained by scrambling the letters in nurdy.