calfs aclfs clafs lcafs alcfs lacfs cafls acfls cfals fcals afcls facls clfas lcfas cflas fclas lfcas flcas alfcs lafcs aflcs falcs lfacs flacs calsf aclsf clasf lcasf alcsf lacsf caslf acslf csalf scalf asclf saclf clsaf lcsaf cslaf sclaf lscaf slcaf alscf lascf aslcf salcf lsacf slacf cafsl acfsl cfasl fcasl afcsl facsl casfl acsfl csafl scafl ascfl sacfl cfsal fcsal csfal scfal fscal sfcal afscl fascl asfcl safcl fsacl sfacl clfsa lcfsa cflsa fclsa lfcsa flcsa clsfa lcsfa cslfa sclfa lscfa slcfa cfsla fcsla csfla scfla fscla sfcla lfsca flsca lsfca slfca fslca sflca alfsc lafsc aflsc falsc lfasc flasc alsfc lasfc aslfc salfc lsafc slafc afslc faslc asflc saflc fsalc sfalc lfsac flsac lsfac slfac fslac sflac
Note: these 'words' (valid or invalid) are all the permutations of the word calfs. These words are obtained by scrambling the letters in calfs.