cleft lceft celft eclft lecft elcft clfet lcfet cflet fclet lfcet flcet ceflt ecflt cfelt fcelt efclt feclt lefct elfct lfect flect eflct felct cletf lcetf celtf ecltf lectf elctf cltef lctef ctlef tclef ltcef tlcef cetlf ectlf ctelf tcelf etclf teclf letcf eltcf ltecf tlecf etlcf telcf clfte lcfte cflte fclte lfcte flcte cltfe lctfe ctlfe tclfe ltcfe tlcfe cftle fctle ctfle tcfle ftcle tfcle lftce fltce ltfce tlfce ftlce tflce ceftl ecftl cfetl fcetl efctl fectl cetfl ectfl ctefl tcefl etcfl tecfl cftel fctel ctfel tcfel ftcel tfcel eftcl fetcl etfcl tefcl ftecl tfecl leftc elftc lfetc fletc efltc feltc letfc eltfc ltefc tlefc etlfc telfc lftec fltec ltfec tlfec ftlec tflec eftlc fetlc etflc teflc ftelc tfelc
Note: these 'words' (valid or invalid) are all the permutations of the word cleft. These words are obtained by scrambling the letters in cleft.