fists ifsts fsits sfits isfts sifts fitss iftss ftiss tfiss itfss tifss fstis sftis ftsis tfsis stfis tsfis istfs sitfs itsfs tisfs stifs tsifs fisst ifsst fsist sfist isfst sifst fisst ifsst fsist sfist isfst sifst fssit sfsit fssit sfsit ssfit ssfit issft sisft issft sisft ssift ssift fitss iftss ftiss tfiss itfss tifss fists ifsts fsits sfits isfts sifts ftsis tfsis fstis sftis tsfis stfis itsfs tisfs istfs sitfs tsifs stifs fstsi sftsi ftssi tfssi stfsi tsfsi fssti sfsti fssti sfsti ssfti ssfti ftssi tfssi fstsi sftsi tsfsi stfsi stsfi tssfi sstfi sstfi tssfi stsfi istsf sitsf itssf tissf stisf tsisf isstf sistf isstf sistf ssitf ssitf itssf tissf istsf sitsf tsisf stisf stsif tssif sstif sstif tssif stsif
Note: these 'words' (valid or invalid) are all the permutations of the word fists. These words are obtained by scrambling the letters in fists.