bobak obbak bboak bboak obbak bobak boabk obabk baobk abobk oabbk aobbk bbaok bbaok babok abbok babok abbok obabk boabk oabbk aobbk baobk abobk bobka obbka bboka bboka obbka bobka bokba obkba bkoba kboba okbba kobba bbkoa bbkoa bkboa kbboa bkboa kbboa obkba bokba okbba kobba bkoba kboba boakb obakb baokb abokb oabkb aobkb bokab obkab bkoab kboab okbab kobab bakob abkob bkaob kbaob akbob kabob oakbb aokbb okabb koabb akobb kaobb bbako bbako babko abbko babko abbko bbkao bbkao bkbao kbbao bkbao kbbao bakbo abkbo bkabo kbabo akbbo kabbo bakbo abkbo bkabo kbabo akbbo kabbo obakb boakb oabkb aobkb baokb abokb obkab bokab okbab kobab bkoab kboab oakbb aokbb okabb koabb akobb kaobb bakob abkob bkaob kbaob akbob kabob
Note: these 'words' (valid or invalid) are all the permutations of the word bobak. These words are obtained by scrambling the letters in bobak.