hfbla fhbla hbfla bhfla fbhla bfhla hflba fhlba hlfba lhfba flhba lfhba hblfa bhlfa hlbfa lhbfa blhfa lbhfa fblha bflha flbha lfbha blfha lbfha hfbal fhbal hbfal bhfal fbhal bfhal hfabl fhabl hafbl ahfbl fahbl afhbl hbafl bhafl habfl ahbfl bahfl abhfl fbahl bfahl fabhl afbhl bafhl abfhl hflab fhlab hlfab lhfab flhab lfhab hfalb fhalb haflb ahflb fahlb afhlb hlafb lhafb halfb ahlfb lahfb alhfb flahb lfahb falhb aflhb lafhb alfhb hblaf bhlaf hlbaf lhbaf blhaf lbhaf hbalf bhalf hablf ahblf bahlf abhlf hlabf lhabf halbf ahlbf lahbf alhbf blahf lbahf balhf ablhf labhf albhf fblah bflah flbah lfbah blfah lbfah fbalh bfalh fablh afblh baflh abflh flabh lfabh falbh aflbh lafbh alfbh blafh lbafh balfh ablfh labfh albfh
Note: these 'words' (valid or invalid) are all the permutations of the word hfbla. These words are obtained by scrambling the letters in hfbla.