rusts ursts rsuts sruts usrts surts rutss urtss rtuss truss utrss turss rstus srtus rtsus trsus strus tsrus ustrs sutrs utsrs tusrs sturs tsurs russt ursst rsust srust usrst surst russt ursst rsust srust usrst surst rssut srsut rssut srsut ssrut ssrut ussrt susrt ussrt susrt ssurt ssurt rutss urtss rtuss truss utrss turss rusts ursts rsuts sruts usrts surts rtsus trsus rstus srtus tsrus strus utsrs tusrs ustrs sutrs tsurs sturs rstsu srtsu rtssu trssu strsu tsrsu rsstu srstu rsstu srstu ssrtu ssrtu rtssu trssu rstsu srtsu tsrsu strsu stsru tssru sstru sstru tssru stsru ustsr sutsr utssr tussr stusr tsusr usstr sustr usstr sustr ssutr ssutr utssr tussr ustsr sutsr tsusr stusr stsur tssur sstur sstur tssur stsur
Note: these 'words' (valid or invalid) are all the permutations of the word rusts. These words are obtained by scrambling the letters in rusts.