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1. Concurrency with blocks

   NSOperationQueue *queue = [[[NSOperationQueue alloc] init] autorelease];
   
   [queue addOperationWithBlock:^{
       CGFloat n = [self resultOfSomeMassiveComputation];
   
       [[NSOperationQueue mainQueue] addOperationWithBlock:^{
           [self updateOnMainThreadWithResult:n];
       }];
   }];