wnab nwab wanb awnb nawb anwb wnba nwba wbna bwna nbwa bnwa wabn awbn wban bwan abwn bawn nabw anbw nbaw bnaw abnw banw
Note: these 'words' (valid or invalid) are all the permutations of the word wnab. These words are obtained by scrambling the letters in wnab.