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Question: help

hey guys i bought my mk unchained today and i tried several times to perform a fatality but i failed. i read that u should press L and then left down right then down and []. for sub zero's fatality but it didnt work he only hit him with a punch.plzzz send me a video where i can see your hands and your psp so i can understand how can i perform a fatality.teo greece!@