buffa ubffa bfufa fbufa ufbfa fubfa buffa ubffa bfufa fbufa ufbfa fubfa bffua fbfua bffua fbfua ffbua ffbua uffba fufba uffba fufba ffuba ffuba bufaf ubfaf bfuaf fbuaf ufbaf fubaf buaff ubaff bauff abuff uabff aubff bfauf fbauf bafuf abfuf fabuf afbuf ufabf fuabf uafbf aufbf faubf afubf bufaf ubfaf bfuaf fbuaf ufbaf fubaf buaff ubaff bauff abuff uabff aubff bfauf fbauf bafuf abfuf fabuf afbuf ufabf fuabf uafbf aufbf faubf afubf bffau fbfau bffau fbfau ffbau ffbau bfafu fbafu baffu abffu fabfu afbfu bfafu fbafu baffu abffu fabfu afbfu ffabu ffabu fafbu affbu fafbu affbu uffab fufab uffab fufab ffuab ffuab ufafb fuafb uaffb auffb faufb afufb ufafb fuafb uaffb auffb faufb afufb ffaub ffaub fafub affub fafub affub
Note: these 'words' (valid or invalid) are all the permutations of the word buffa. These words are obtained by scrambling the letters in buffa.