bibbs ibbbs bbibs bbibs ibbbs bibbs bibbs ibbbs bbibs bbibs ibbbs bibbs bbbis bbbis bbbis bbbis bbbis bbbis ibbbs bibbs ibbbs bibbs bbibs bbibs bibsb ibbsb bbisb bbisb ibbsb bibsb bisbb ibsbb bsibb sbibb isbbb sibbb bbsib bbsib bsbib sbbib bsbib sbbib ibsbb bisbb isbbb sibbb bsibb sbibb bibsb ibbsb bbisb bbisb ibbsb bibsb bisbb ibsbb bsibb sbibb isbbb sibbb bbsib bbsib bsbib sbbib bsbib sbbib ibsbb bisbb isbbb sibbb bsibb sbibb bbbsi bbbsi bbbsi bbbsi bbbsi bbbsi bbsbi bbsbi bsbbi sbbbi bsbbi sbbbi bbsbi bbsbi bsbbi sbbbi bsbbi sbbbi bbsbi bbsbi bsbbi sbbbi bsbbi sbbbi ibbsb bibsb ibbsb bibsb bbisb bbisb ibsbb bisbb isbbb sibbb bsibb sbibb ibsbb bisbb isbbb sibbb bsibb sbibb bbsib bbsib bsbib sbbib bsbib sbbib
Note: these 'words' (valid or invalid) are all the permutations of the word bibbs. These words are obtained by scrambling the letters in bibbs.