iOS 6 PTL: Chapter 2 Errata

We made a typo in Chapter 2, section Collection Literals. The syntax for creating a new NSDictionary was written as   NSDictionary *dict = @[@"key1":@"value1", @"key2":@"value2", @"key2":@"value2"] NSDictionary *dict = @[@"key1":@"value1", @"key2":@"value2",...

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