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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 validate(cls, full_config: typing.Dict[str, typing.Any]) -> typing.Optional[typing.Dict[str, typing.Any]]: """ Validate and parse config. This method will be called by the filters factory when you bind this filter. Must be overridden. :param full_config: dict with arguments passed to handler registrar :return: Current filter config """

        pass