tnris ntris trnis rtnis nrtis rntis tnirs ntirs tinrs itnrs nitrs intrs trins rtins tirns itrns ritns irtns nrits rnits nirts inrts rints irnts tnrsi ntrsi trnsi rtnsi nrtsi rntsi tnsri ntsri tsnri stnri nstri sntri trsni rtsni tsrni strni rstni srtni nrsti rnsti nsrti snrti rsnti srnti tnisr ntisr tinsr itnsr nitsr intsr tnsir ntsir tsnir stnir nstir sntir tisnr itsnr tsinr stinr istnr sitnr nistr instr nsitr snitr isntr sintr trisn rtisn tirsn itrsn ritsn irtsn trsin rtsin tsrin strin rstin srtin tisrn itsrn tsirn stirn istrn sitrn ristn irstn rsitn sritn isrtn sirtn nrist rnist nirst inrst rinst irnst nrsit rnsit nsrit snrit rsnit srnit nisrt insrt nsirt snirt isnrt sinrt risnt irsnt rsint srint isrnt sirnt
Note: these 'words' (valid or invalid) are all the permutations of the word tnris. These words are obtained by scrambling the letters in tnris.