plack lpack palck aplck lapck alpck plcak lpcak pclak cplak lcpak clpak paclk apclk pcalk cpalk acplk caplk lacpk alcpk lcapk clapk aclpk calpk plakc lpakc palkc aplkc lapkc alpkc plkac lpkac pklac kplac lkpac klpac paklc apklc pkalc kpalc akplc kaplc lakpc alkpc lkapc klapc aklpc kalpc plcka lpcka pclka cplka lcpka clpka plkca lpkca pklca kplca lkpca klpca pckla cpkla pkcla kpcla ckpla kcpla lckpa clkpa lkcpa klcpa cklpa kclpa packl apckl pcakl cpakl acpkl capkl pakcl apkcl pkacl kpacl akpcl kapcl pckal cpkal pkcal kpcal ckpal kcpal ackpl cakpl akcpl kacpl ckapl kcapl lackp alckp lcakp clakp aclkp calkp lakcp alkcp lkacp klacp aklcp kalcp lckap clkap lkcap klcap cklap kclap acklp caklp akclp kaclp ckalp kcalp
Note: these 'words' (valid or invalid) are all the permutations of the word plack. These words are obtained by scrambling the letters in plack.