lbffa blffa lfbfa flbfa bflfa fblfa lbffa blffa lfbfa flbfa bflfa fblfa lffba flfba lffba flfba fflba fflba bffla fbfla bffla fbfla ffbla ffbla lbfaf blfaf lfbaf flbaf bflaf fblaf lbaff blaff labff albff balff ablff lfabf flabf lafbf alfbf falbf aflbf bfalf fbalf baflf abflf fablf afblf lbfaf blfaf lfbaf flbaf bflaf fblaf lbaff blaff labff albff balff ablff lfabf flabf lafbf alfbf falbf aflbf bfalf fbalf baflf abflf fablf afblf lffab flfab lffab flfab fflab fflab lfafb flafb laffb alffb falfb aflfb lfafb flafb laffb alffb falfb aflfb ffalb ffalb faflb afflb faflb afflb bffal fbfal bffal fbfal ffbal ffbal bfafl fbafl baffl abffl fabfl afbfl bfafl fbafl baffl abffl fabfl afbfl ffabl ffabl fafbl affbl fafbl affbl
Note: these 'words' (valid or invalid) are all the permutations of the word lbffa. These words are obtained by scrambling the letters in lbffa.