intro nitro itnro tinro ntiro tniro inrto nirto irnto rinto nrito rnito itrno tirno irtno ritno trino rtino ntrio tnrio nrtio rntio trnio rtnio intor nitor itnor tinor ntior tnior inotr niotr iontr ointr noitr onitr itonr tionr iotnr oitnr toinr otinr ntoir tnoir notir ontir tonir otnir inrot nirot irnot rinot nriot rniot inort niort ionrt oinrt noirt onirt iront riont iornt oirnt roint orint nroit rnoit norit onrit ronit ornit itron tiron irton riton trion rtion itorn tiorn iotrn oitrn toirn otirn irotn riotn iortn oirtn roitn oritn troin rtoin torin otrin rotin ortin ntroi tnroi nrtoi rntoi trnoi rtnoi ntori tnori notri ontri tonri otnri nroti rnoti norti onrti ronti ornti troni rtoni torni otrni rotni ortni
Note: these 'words' (valid or invalid) are all the permutations of the word intro. These words are obtained by scrambling the letters in intro.