banak abnak bnaak nbaak anbak nabak baank abank baank abank aabnk aabnk bnaak nbaak banak abnak nabak anbak anabk naabk aanbk aanbk naabk anabk banka abnka bnaka nbaka anbka nabka bakna abkna bkana kbana akbna kabna bnkaa nbkaa bknaa kbnaa nkbaa knbaa ankba nakba aknba kanba nkaba knaba baakn abakn baakn abakn aabkn aabkn bakan abkan bkaan kbaan akban kaban bakan abkan bkaan kbaan akban kaban aakbn aakbn akabn kaabn akabn kaabn bnaka nbaka banka abnka nabka anbka bnkaa nbkaa bknaa kbnaa nkbaa knbaa bakna abkna bkana kbana akbna kabna nakba ankba nkaba knaba aknba kanba anakb naakb aankb aankb naakb anakb ankab nakab aknab kanab nkaab knaab aaknb aaknb akanb kaanb akanb kaanb nakab ankab nkaab knaab aknab kanab
Note: these 'words' (valid or invalid) are all the permutations of the word banak. These words are obtained by scrambling the letters in banak.