tnacc ntacc tancc atncc natcc antcc tncac ntcac tcnac ctnac nctac cntac tacnc atcnc tcanc ctanc actnc catnc nactc anctc ncatc cnatc acntc cantc tnacc ntacc tancc atncc natcc antcc tncac ntcac tcnac ctnac nctac cntac tacnc atcnc tcanc ctanc actnc catnc nactc anctc ncatc cnatc acntc cantc tncca ntcca tcnca ctnca nctca cntca tncca ntcca tcnca ctnca nctca cntca tccna ctcna tccna ctcna cctna cctna nccta cncta nccta cncta ccnta ccnta taccn atccn tcacn ctacn actcn catcn taccn atccn tcacn ctacn actcn catcn tccan ctcan tccan ctcan cctan cctan acctn cactn acctn cactn ccatn ccatn nacct ancct ncact cnact acnct canct nacct ancct ncact cnact acnct canct nccat cncat nccat cncat ccnat ccnat accnt cacnt accnt cacnt ccant ccant
Note: these 'words' (valid or invalid) are all the permutations of the word tnacc. These words are obtained by scrambling the letters in tnacc.