gxsi xgsi gsxi sgxi xsgi sxgi gxis xgis gixs igxs xigs ixgs gsix sgix gisx igsx sigx isgx xsig sxig xisg ixsg sixg isxg
Note: these 'words' (valid or invalid) are all the permutations of the word gxsi. These words are obtained by scrambling the letters in gxsi.