crank rcank carnk acrnk racnk arcnk crnak rcnak cnrak ncrak rncak nrcak canrk acnrk cnark ncark ancrk nacrk ranck arnck rnack nrack anrck narck crakn rcakn carkn acrkn rackn arckn crkan rckan ckran kcran rkcan krcan cakrn ackrn ckarn kcarn akcrn kacrn rakcn arkcn rkacn kracn akrcn karcn crnka rcnka cnrka ncrka rncka nrcka crkna rckna ckrna kcrna rkcna krcna cnkra nckra cknra kcnra nkcra kncra rnkca nrkca rknca krnca nkrca knrca cankr acnkr cnakr ncakr anckr nackr caknr acknr ckanr kcanr akcnr kacnr cnkar nckar cknar kcnar nkcar kncar ankcr nakcr akncr kancr nkacr knacr rankc arnkc rnakc nrakc anrkc narkc raknc arknc rkanc kranc akrnc karnc rnkac nrkac rknac krnac nkrac knrac ankrc nakrc aknrc kanrc nkarc knarc
Note: these 'words' (valid or invalid) are all the permutations of the word crank. These words are obtained by scrambling the letters in crank.