clerk lcerk celrk eclrk lecrk elcrk clrek lcrek crlek rclek lrcek rlcek cerlk ecrlk crelk rcelk erclk reclk lerck elrck lreck rleck erlck relck clekr lcekr celkr eclkr leckr elckr clker lcker ckler kcler lkcer klcer ceklr ecklr ckelr kcelr ekclr keclr lekcr elkcr lkecr klecr eklcr kelcr clrke lcrke crlke rclke lrcke rlcke clkre lckre cklre kclre lkcre klcre crkle rckle ckrle kcrle rkcle krcle lrkce rlkce lkrce klrce rklce krlce cerkl ecrkl crekl rcekl erckl reckl cekrl eckrl ckerl kcerl ekcrl kecrl crkel rckel ckrel kcrel rkcel krcel erkcl rekcl ekrcl kercl rkecl krecl lerkc elrkc lrekc rlekc erlkc relkc lekrc elkrc lkerc klerc eklrc kelrc lrkec rlkec lkrec klrec rklec krlec erklc reklc ekrlc kerlc rkelc krelc
Note: these 'words' (valid or invalid) are all the permutations of the word clerk. These words are obtained by scrambling the letters in clerk.