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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 register_signals(self, app):
 """Register the signals."""

        before_record_index.connect(inject_provisional_community)
        if app.config['COMMUNITIES_OAI_ENABLED']:
            listen(Community, 'after_insert', create_oaipmh_set)
            listen(Community, 'after_delete', destroy_oaipmh_set)
        inclusion_request_created.connect(new_request)