rudis urdis rduis druis udris duris ruids urids riuds iruds uirds iurds rdius drius ridus irdus dirus idrus udirs duirs uidrs iudrs diurs idurs rudsi urdsi rdusi drusi udrsi dursi rusdi ursdi rsudi srudi usrdi surdi rdsui drsui rsdui srdui dsrui sdrui udsri dusri usdri sudri dsuri sduri ruisd urisd riusd irusd uirsd iursd rusid ursid rsuid sruid usrid surid risud irsud rsiud sriud isrud sirud uisrd iusrd usird suird isurd siurd rdisu drisu ridsu irdsu dirsu idrsu rdsiu drsiu rsdiu srdiu dsriu sdriu risdu irsdu rsidu sridu isrdu sirdu disru idsru dsiru sdiru isdru sidru udisr duisr uidsr iudsr diusr idusr udsir dusir usdir sudir dsuir sduir uisdr iusdr usidr suidr isudr siudr disur idsur dsiur sdiur isdur sidur
Note: these 'words' (valid or invalid) are all the permutations of the word rudis. These words are obtained by scrambling the letters in rudis.