rcstn crstn rsctn srctn csrtn scrtn rctsn crtsn rtcsn trcsn ctrsn tcrsn rstcn srtcn rtscn trscn strcn tsrcn cstrn sctrn ctsrn tcsrn stcrn tscrn rcsnt crsnt rscnt srcnt csrnt scrnt rcnst crnst rncst nrcst cnrst ncrst rsnct srnct rnsct nrsct snrct nsrct csnrt scnrt cnsrt ncsrt sncrt nscrt rctns crtns rtcns trcns ctrns tcrns rcnts crnts rncts nrcts cnrts ncrts rtncs trncs rntcs nrtcs tnrcs ntrcs ctnrs tcnrs cntrs nctrs tncrs ntcrs rstnc srtnc rtsnc trsnc strnc tsrnc rsntc srntc rnstc nrstc snrtc nsrtc rtnsc trnsc rntsc nrtsc tnrsc ntrsc stnrc tsnrc sntrc nstrc tnsrc ntsrc cstnr sctnr ctsnr tcsnr stcnr tscnr csntr scntr cnstr ncstr snctr nsctr ctnsr tcnsr cntsr nctsr tncsr ntcsr stncr tsncr sntcr nstcr tnscr ntscr
Note: these 'words' (valid or invalid) are all the permutations of the word rcstn. These words are obtained by scrambling the letters in rcstn.