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1. GCD: getting notified when all tasks from group are finished

   let myConcurrentQueue = dispatch_queue_create("myConcurrentQueue", DISPATCH_QUEUE_CONCURRENT)
   let group = dispatch_group_create()
   
   dispatch_group_notify(group, dispatch_get_main_queue()) {
       print("done")
   }
   
   for i in 0..<5 {
       dispatch_group_async(group, myConcurrentQueue) {
           print(i, NSThread.currentThread())
       }
   }