natch antch ntach tnach atnch tanch nacth ancth ncath cnath acnth canth ntcah tncah nctah cntah tcnah ctnah atcnh tacnh actnh catnh tcanh ctanh nathc anthc ntahc tnahc atnhc tanhc nahtc anhtc nhatc hnatc ahntc hantc nthac tnhac nhtac hntac thnac htnac athnc tahnc ahtnc hatnc thanc htanc nacht ancht ncaht cnaht acnht canht nahct anhct nhact hnact ahnct hanct nchat cnhat nhcat hncat chnat hcnat achnt cahnt ahcnt hacnt chant hcant ntcha tncha nctha cntha tcnha ctnha nthca tnhca nhtca hntca thnca htnca nchta cnhta nhcta hncta chnta hcnta tchna cthna thcna htcna chtna hctna atchn tachn acthn cathn tcahn ctahn athcn tahcn ahtcn hatcn thacn htacn achtn cahtn ahctn hactn chatn hcatn tchan cthan thcan htcan chtan hctan
Note: these 'words' (valid or invalid) are all the permutations of the word natch. These words are obtained by scrambling the letters in natch.