knack nkack kanck aknck nakck ankck kncak nkcak kcnak cknak nckak cnkak kacnk akcnk kcank ckank acknk caknk nackk anckk ncakk cnakk acnkk cankk knakc nkakc kankc aknkc nakkc ankkc knkac nkkac kknac kknac nkkac knkac kaknc akknc kkanc kkanc akknc kaknc nakkc ankkc nkakc knakc aknkc kankc kncka nkcka kcnka cknka nckka cnkka knkca nkkca kknca kknca nkkca knkca kckna ckkna kkcna kkcna ckkna kckna nckka cnkka nkcka kncka cknka kcnka kackn akckn kcakn ckakn ackkn cakkn kakcn akkcn kkacn kkacn akkcn kakcn kckan ckkan kkcan kkcan ckkan kckan ackkn cakkn akckn kackn ckakn kcakn nackk anckk ncakk cnakk acnkk cankk nakck ankck nkack knack aknck kanck nckak cnkak nkcak kncak cknak kcnak acknk caknk akcnk kacnk ckank kcank
Note: these 'words' (valid or invalid) are all the permutations of the word knack. These words are obtained by scrambling the letters in knack.