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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 add_before(self, pipeline):
 """Add a Pipeline to be applied before this processing pipeline. Arguments: pipeline: The Pipeline or callable to apply before this Pipeline. """

        if not isinstance(pipeline, Pipeline):
            pipeline = Pipeline(pipeline)
        self.pipes = pipeline.pipes[:] + self.pipes[:]
        return self