tcreq ctreq trceq rtceq crteq rcteq tcerq cterq tecrq etcrq cetrq ectrq trecq rtecq tercq etrcq retcq ertcq cretq rcetq certq ecrtq rectq erctq tcrqe ctrqe trcqe rtcqe crtqe rctqe tcqre ctqre tqcre qtcre cqtre qctre trqce rtqce tqrce qtrce rqtce qrtce crqte rcqte cqrte qcrte rqcte qrcte tceqr cteqr tecqr etcqr cetqr ectqr tcqer ctqer tqcer qtcer cqter qcter teqcr etqcr tqecr qtecr eqtcr qetcr ceqtr ecqtr cqetr qcetr eqctr qectr treqc rteqc terqc etrqc retqc ertqc trqec rtqec tqrec qtrec rqtec qrtec teqrc etqrc tqerc qterc eqtrc qetrc reqtc erqtc rqetc qretc eqrtc qertc creqt rceqt cerqt ecrqt recqt ercqt crqet rcqet cqret qcret rqcet qrcet ceqrt ecqrt cqert qcert eqcrt qecrt reqct erqct rqect qrect eqrct qerct
Note: these 'words' (valid or invalid) are all the permutations of the word tcreq. These words are obtained by scrambling the letters in tcreq.