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Special methods for adding subscripting
// To add array style subscripting:
- (void)setObject:(id)obj atIndexedSubscript:(NSUInteger)idx; // setter
- (id)objectAtIndexedSubscript:(NSUInteger)idx; // getter
// To add dictionary style subscripting
- (void)setObject:(id)obj forKeyedSubscript:(id <NSCopying>)key; // setter
- (id)objectForKeyedSubscript:(id)key; // getter
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