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1#import <Foundation/Foundation.h>2 3@interface Foo : NSObject4+(int) doSomethingWithString: (NSString *) string;5-(int) doSomethingInstance: (NSString *) string;6@end7 8@implementation Foo9+(int) doSomethingWithString: (NSString *) string10{11 NSLog (@"String is: %@.", string);12 return [string length];13}14 15-(int) doSomethingInstance: (NSString *)string16{17 return [Foo doSomethingWithString:string];18}19@end20 21int main()22{23 return 0; // Set breakpoint here.24}25