dstan sdtan dtsan tdsan stdan tsdan dsatn sdatn dastn adstn sadtn asdtn dtasn tdasn datsn adtsn tadsn atdsn stadn tsadn satdn astdn tasdn atsdn dstna sdtna dtsna tdsna stdna tsdna dsnta sdnta dnsta ndsta sndta nsdta dtnsa tdnsa dntsa ndtsa tndsa ntdsa stnda tsnda sntda nstda tnsda ntsda dsant sdant dasnt adsnt sadnt asdnt dsnat sdnat dnsat ndsat sndat nsdat danst adnst dnast ndast andst nadst sandt asndt snadt nsadt ansdt nasdt dtans tdans datns adtns tadns atdns dtnas tdnas dntas ndtas tndas ntdas dants adnts dnats ndats andts nadts tands atnds tnads ntads antds natds stand tsand satnd astnd tasnd atsnd stnad tsnad sntad nstad tnsad ntsad santd asntd snatd nsatd anstd nastd tansd atnsd tnasd ntasd antsd natsd
Note: these 'words' (valid or invalid) are all the permutations of the word dstan. These words are obtained by scrambling the letters in dstan.