recks ercks rceks creks ecrks cerks rekcs erkcs rkecs krecs ekrcs kercs rckes crkes rkces krces ckres kcres eckrs cekrs ekcrs kecrs ckers kcers recsk ercsk rcesk cresk ecrsk cersk resck ersck rseck sreck esrck serck rcsek crsek rscek srcek csrek screk ecsrk cesrk escrk secrk cserk scerk reksc erksc rkesc kresc ekrsc kersc reskc erskc rsekc srekc esrkc serkc rksec krsec rskec srkec ksrec skrec eksrc kesrc eskrc sekrc kserc skerc rckse crkse rkcse krcse ckrse kcrse rcske crske rscke srcke csrke scrke rksce krsce rskce srkce ksrce skrce cksre kcsre cskre sckre kscre skcre ecksr ceksr ekcsr kecsr ckesr kcesr ecskr ceskr esckr seckr csekr scekr ekscr kescr eskcr sekcr ksecr skecr ckser kcser csker scker kscer skcer
Note: these 'words' (valid or invalid) are all the permutations of the word recks. These words are obtained by scrambling the letters in recks.