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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 buildCatalogs(self, exclusions=None, **kwargs):
 """ Primary interface to build catalogs based on user inputs. """

        self.generateXY(**kwargs)
        self.generateRaDec()
        if exclusions:
            self.apply_exclusions(exclusions)

        # apply selection limits as specified by the user:
        self.apply_flux_limits()