yifg iyfg yfig fyig ifyg fiyg yigf iygf ygif gyif igyf giyf yfgi fygi ygfi gyfi fgyi gfyi ifgy figy igfy gify fgiy gfiy
Note: these 'words' (valid or invalid) are all the permutations of the word yifg. These words are obtained by scrambling the letters in yifg.