drsfa rdsfa dsrfa sdrfa rsdfa srdfa drfsa rdfsa dfrsa fdrsa rfdsa frdsa dsfra sdfra dfsra fdsra sfdra fsdra rsfda srfda rfsda frsda sfrda fsrda drsaf rdsaf dsraf sdraf rsdaf srdaf drasf rdasf darsf adrsf radsf ardsf dsarf sdarf dasrf adsrf sadrf asdrf rsadf sradf rasdf arsdf sardf asrdf drfas rdfas dfras fdras rfdas frdas drafs rdafs darfs adrfs radfs ardfs dfars fdars dafrs adfrs fadrs afdrs rfads frads rafds arfds fards afrds dsfar sdfar dfsar fdsar sfdar fsdar dsafr sdafr dasfr adsfr sadfr asdfr dfasr fdasr dafsr adfsr fadsr afdsr sfadr fsadr safdr asfdr fasdr afsdr rsfad srfad rfsad frsad sfrad fsrad rsafd srafd rasfd arsfd sarfd asrfd rfasd frasd rafsd arfsd farsd afrsd sfard fsard safrd asfrd fasrd afsrd
Note: these 'words' (valid or invalid) are all the permutations of the word drsfa. These words are obtained by scrambling the letters in drsfa.