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Solve the following problem using Python, implementing the functions described below, one line at a time
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Description:
 def set_key_color(self, color: Tuple[int, int, int]) -> None: """Set a color to be transparent during blitting functions. Args: color (Union[Tuple[int, int, int], Sequence[int]]):
 An (r, g, b) sequence or Color instance. """

        lib.TCOD_image_set_key_color(self.image_c, color)