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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 get_default(self, stmt, refd):
 """Return default value for `stmt` node. `refd` is a dictionary of applicable refinements that is constructed in the `process_patches` method. """

        if refd["default"]:
                return refd["default"]
        defst = stmt.search_one("default")
        if defst:
            return defst.arg
        return None