tsrip strip trsip rtsip srtip rstip tsirp stirp tisrp itsrp sitrp istrp trisp rtisp tirsp itrsp ritsp irtsp sritp rsitp sirtp isrtp ristp irstp tsrpi strpi trspi rtspi srtpi rstpi tspri stpri tpsri ptsri sptri pstri trpsi rtpsi tprsi ptrsi rptsi prtsi srpti rspti sprti psrti rpsti prsti tsipr stipr tispr itspr sitpr istpr tspir stpir tpsir ptsir sptir pstir tipsr itpsr tpisr ptisr iptsr pitsr siptr isptr spitr psitr ipstr pistr trips rtips tirps itrps ritps irtps trpis rtpis tpris ptris rptis prtis tiprs itprs tpirs ptirs iptrs pitrs ripts irpts rpits prits iprts pirts sript rsipt sirpt isrpt rispt irspt srpit rspit sprit psrit rpsit prsit siprt isprt spirt psirt ipsrt pisrt ripst irpst rpist prist iprst pirst
Note: these 'words' (valid or invalid) are all the permutations of the word tsrip. These words are obtained by scrambling the letters in tsrip.