rndiy nrdiy rdniy drniy ndriy dnriy rnidy nridy rindy irndy nirdy inrdy rdiny driny ridny irdny dirny idrny ndiry dniry nidry indry dinry idnry rndyi nrdyi rdnyi drnyi ndryi dnryi rnydi nrydi ryndi yrndi nyrdi ynrdi rdyni dryni rydni yrdni dyrni ydrni ndyri dnyri nydri yndri dynri ydnri rniyd nriyd rinyd irnyd niryd inryd rnyid nryid rynid yrnid nyrid ynrid riynd irynd ryind yrind iyrnd yirnd niyrd inyrd nyird ynird iynrd yinrd rdiyn driyn ridyn irdyn diryn idryn rdyin dryin rydin yrdin dyrin ydrin riydn irydn ryidn yridn iyrdn yirdn diyrn idyrn dyirn ydirn iydrn yidrn ndiyr dniyr nidyr indyr dinyr idnyr ndyir dnyir nydir yndir dynir ydnir niydr inydr nyidr ynidr iyndr yindr diynr idynr dyinr ydinr iydnr yidnr
Note: these 'words' (valid or invalid) are all the permutations of the word rndiy. These words are obtained by scrambling the letters in rndiy.