fleck lfeck felck eflck lefck elfck flcek lfcek fclek cflek lcfek clfek feclk efclk fcelk cfelk ecflk ceflk lecfk elcfk lcefk clefk eclfk celfk flekc lfekc felkc eflkc lefkc elfkc flkec lfkec fklec kflec lkfec klfec feklc efklc fkelc kfelc ekflc keflc lekfc elkfc lkefc klefc eklfc kelfc flcke lfcke fclke cflke lcfke clfke flkce lfkce fklce kflce lkfce klfce fckle cfkle fkcle kfcle ckfle kcfle lckfe clkfe lkcfe klcfe cklfe kclfe feckl efckl fcekl cfekl ecfkl cefkl fekcl efkcl fkecl kfecl ekfcl kefcl fckel cfkel fkcel kfcel ckfel kcfel eckfl cekfl ekcfl kecfl ckefl kcefl leckf elckf lcekf clekf eclkf celkf lekcf elkcf lkecf klecf eklcf kelcf lckef clkef lkcef klcef cklef kclef ecklf ceklf ekclf keclf ckelf kcelf
Note: these 'words' (valid or invalid) are all the permutations of the word fleck. These words are obtained by scrambling the letters in fleck.