franc rfanc farnc afrnc rafnc arfnc frnac rfnac fnrac nfrac rnfac nrfac fanrc afnrc fnarc nfarc anfrc nafrc ranfc arnfc rnafc nrafc anrfc narfc fracn rfacn farcn afrcn rafcn arfcn frcan rfcan fcran cfran rcfan crfan facrn afcrn fcarn cfarn acfrn cafrn racfn arcfn rcafn crafn acrfn carfn frnca rfnca fnrca nfrca rnfca nrfca frcna rfcna fcrna cfrna rcfna crfna fncra nfcra fcnra cfnra ncfra cnfra rncfa nrcfa rcnfa crnfa ncrfa cnrfa fancr afncr fnacr nfacr anfcr nafcr facnr afcnr fcanr cfanr acfnr cafnr fncar nfcar fcnar cfnar ncfar cnfar ancfr nacfr acnfr canfr ncafr cnafr rancf arncf rnacf nracf anrcf narcf racnf arcnf rcanf cranf acrnf carnf rncaf nrcaf rcnaf crnaf ncraf cnraf ancrf nacrf acnrf canrf ncarf cnarf
Note: these 'words' (valid or invalid) are all the permutations of the word franc. These words are obtained by scrambling the letters in franc.