ytost tyost yotst oytst toyst otyst ytsot tysot ystot sytot tsyot styot yostt oystt ysott syott osytt soytt tosyt otsyt tsoyt stoyt ostyt sotyt ytots tyots yotts oytts toyts otyts yttos tytos yttos tytos ttyos ttyos yotts oytts ytots tyots otyts toyts totys ottys ttoys ttoys ottys totys ytsto tysto ystto sytto tsyto styto yttso tytso yttso tytso ttyso ttyso ystto sytto ytsto tysto styto tsyto tstyo sttyo ttsyo ttsyo sttyo tstyo yostt oystt ysott syott osytt soytt yotst oytst ytost tyost otyst toyst ystot sytot ytsot tysot styot tsyot ostyt sotyt otsyt tosyt stoyt tsoyt tosty otsty tsoty stoty ostty sotty totsy ottsy ttosy ttosy ottsy totsy tstoy sttoy ttsoy ttsoy sttoy tstoy ostty sotty otsty tosty stoty tsoty
Note: these 'words' (valid or invalid) are all the permutations of the word ytost. These words are obtained by scrambling the letters in ytost.