feers efers feers efers eefrs eefrs feres efres frees rfees erfes refes feres efres frees rfees erfes refes eerfs eerfs erefs reefs erefs reefs feesr efesr feesr efesr eefsr eefsr feser efser fseer sfeer esfer sefer feser efser fseer sfeer esfer sefer eesfr eesfr esefr seefr esefr seefr ferse efrse frese rfese erfse refse fesre efsre fsere sfere esfre sefre frsee rfsee fsree sfree rsfee srfee ersfe resfe esrfe serfe rsefe srefe ferse efrse frese rfese erfse refse fesre efsre fsere sfere esfre sefre frsee rfsee fsree sfree rsfee srfee ersfe resfe esrfe serfe rsefe srefe eersf eersf eresf reesf eresf reesf eesrf eesrf eserf seerf eserf seerf ersef resef esref seref rseef sreef ersef resef esref seref rseef sreef
Note: these 'words' (valid or invalid) are all the permutations of the word feers. These words are obtained by scrambling the letters in feers.