foist ofist fiost ifost oifst iofst fosit ofsit fsoit sfoit osfit sofit fisot ifsot fsiot sfiot isfot sifot oisft iosft osift soift isoft sioft foits ofits fiots ifots oifts iofts fotis oftis ftois tfois otfis tofis fitos iftos ftios tfios itfos tifos oitfs iotfs otifs toifs itofs tiofs fosti ofsti fsoti sfoti osfti softi fotsi oftsi ftosi tfosi otfsi tofsi fstoi sftoi ftsoi tfsoi stfoi tsfoi ostfi sotfi otsfi tosfi stofi tsofi fisto ifsto fsito sfito isfto sifto fitso iftso ftiso tfiso itfso tifso fstio sftio ftsio tfsio stfio tsfio istfo sitfo itsfo tisfo stifo tsifo oistf iostf ositf soitf isotf siotf oitsf iotsf otisf toisf itosf tiosf ostif sotif otsif tosif stoif tsoif istof sitof itsof tisof stiof tsiof
Note: these 'words' (valid or invalid) are all the permutations of the word foist. These words are obtained by scrambling the letters in foist.