saist asist siast isast aisst iasst sasit assit ssait ssait assit sasit sisat issat ssiat ssiat issat sisat aisst iasst asist saist isast siast saits asits siats isats aists iasts satis astis stais tsais atsis tasis sitas istas stias tsias itsas tisas aitss iatss atiss taiss itass tiass sasti assti ssati ssati assti sasti satsi astsi stasi tsasi atssi tassi sstai sstai stsai tssai stsai tssai astsi satsi atssi tassi stasi tsasi sista issta ssita ssita issta sista sitsa istsa stisa tsisa itssa tissa sstia sstia stsia tssia stsia tssia istsa sitsa itssa tissa stisa tsisa aists iasts asits saits isats siats aitss iatss atiss taiss itass tiass astis satis atsis tasis stais tsais istas sitas itsas tisas stias tsias
Note: these 'words' (valid or invalid) are all the permutations of the word saist. These words are obtained by scrambling the letters in saist.