sibbs isbbs sbibs bsibs ibsbs bisbs sibbs isbbs sbibs bsibs ibsbs bisbs sbbis bsbis sbbis bsbis bbsis bbsis ibbss bibss ibbss bibss bbiss bbiss sibsb isbsb sbisb bsisb ibssb bissb sisbb issbb ssibb ssibb issbb sisbb sbsib bssib ssbib ssbib bssib sbsib ibssb bissb isbsb sibsb bsisb sbisb sibsb isbsb sbisb bsisb ibssb bissb sisbb issbb ssibb ssibb issbb sisbb sbsib bssib ssbib ssbib bssib sbsib ibssb bissb isbsb sibsb bsisb sbisb sbbsi bsbsi sbbsi bsbsi bbssi bbssi sbsbi bssbi ssbbi ssbbi bssbi sbsbi sbsbi bssbi ssbbi ssbbi bssbi sbsbi bbssi bbssi bsbsi sbbsi bsbsi sbbsi ibbss bibss ibbss bibss bbiss bbiss ibsbs bisbs isbbs sibbs bsibs sbibs ibsbs bisbs isbbs sibbs bsibs sbibs bbsis bbsis bsbis sbbis bsbis sbbis
Note: these 'words' (valid or invalid) are all the permutations of the word sibbs. These words are obtained by scrambling the letters in sibbs.