guvs ugvs gvus vgus uvgs vugs gusv ugsv gsuv sguv usgv sugv gvsu vgsu gsvu sgvu vsgu svgu uvsg vusg usvg suvg vsug svug
Note: these 'words' (valid or invalid) are all the permutations of the word guvs. These words are obtained by scrambling the letters in guvs.