self.context=[[NSManagedObjectContext alloc] initWithConcurrencyType:NSPrivateQueueConcurrencyType];
[self.context setPersistentStoreCoordinator:dm.PSC];
[[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(mocDidSaveNotification:) name:NSManagedObjectContextDidSaveNotification object:nil];
[self.context setMergePolicy:NSMergeByPropertyObjectTrumpMergePolicy];//important!!!
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