sacks ascks scaks csaks acsks casks sakcs askcs skacs ksacs akscs kascs sckas cskas skcas kscas cksas kcsas ackss cakss akcss kacss ckass kcass sacsk ascsk scask csask acssk cassk sasck assck ssack ssack assck sasck scsak cssak sscak sscak cssak scsak acssk cassk ascsk sacsk csask scask saksc asksc skasc ksasc akssc kassc saskc asskc ssakc ssakc asskc saskc sksac kssac sskac sskac kssac sksac akssc kassc asksc saksc ksasc skasc scksa csksa skcsa kscsa ckssa kcssa scska csska sscka sscka csska scska sksca kssca sskca sskca kssca sksca ckssa kcssa csksa scksa kscsa skcsa ackss cakss akcss kacss ckass kcass acsks casks ascks sacks csaks scaks akscs kascs askcs sakcs ksacs skacs cksas kcsas cskas sckas kscas skcas
Note: these 'words' (valid or invalid) are all the permutations of the word sacks. These words are obtained by scrambling the letters in sacks.