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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 engineIncluded(self, name):
 """Utility method to check if a storage engine is included in graphs. @param name: Name of storage engine. @return: Returns True if included in graphs, False otherwise. """

        if self._engines is None:
            self._engines = self._dbconn.getStorageEngines()
        return self.envCheckFilter('engine', name) and name in self._engines