facts afcts fcats cfats acfts cafts fatcs aftcs ftacs tfacs atfcs tafcs fctas cftas ftcas tfcas ctfas tcfas actfs catfs atcfs tacfs ctafs tcafs facst afcst fcast cfast acfst cafst fasct afsct fsact sfact asfct safct fcsat cfsat fscat sfcat csfat scfat acsft casft ascft sacft csaft scaft fatsc aftsc ftasc tfasc atfsc tafsc fastc afstc fsatc sfatc asftc saftc ftsac tfsac fstac sftac tsfac stfac atsfc tasfc astfc satfc tsafc stafc fctsa cftsa ftcsa tfcsa ctfsa tcfsa fcsta cfsta fscta sfcta csfta scfta ftsca tfsca fstca sftca tsfca stfca ctsfa tcsfa cstfa sctfa tscfa stcfa actsf catsf atcsf tacsf ctasf tcasf acstf castf asctf sactf csatf scatf atscf tascf astcf satcf tsacf stacf ctsaf tcsaf cstaf sctaf tscaf stcaf
Note: these 'words' (valid or invalid) are all the permutations of the word facts. These words are obtained by scrambling the letters in facts.