drain rdain darin adrin radin ardin drian rdian diran idran ridan irdan dairn adirn diarn idarn aidrn iadrn raidn aridn riadn iradn airdn iardn drani rdani darni adrni radni ardni drnai rdnai dnrai ndrai rndai nrdai danri adnri dnari ndari andri nadri randi arndi rnadi nradi anrdi nardi drina rdina dirna idrna ridna irdna drnia rdnia dnria ndria rndia nrdia dinra idnra dnira ndira indra nidra rinda irnda rnida nrida inrda nirda dainr adinr dianr idanr aidnr iadnr danir adnir dnair ndair andir nadir dinar idnar dniar ndiar indar nidar aindr iandr anidr naidr inadr niadr raind arind riand irand airnd iarnd ranid arnid rnaid nraid anrid narid rinad irnad rniad nriad inrad nirad ainrd ianrd anird naird inard niard
Note: these 'words' (valid or invalid) are all the permutations of the word drain. These words are obtained by scrambling the letters in drain.