 					a1![prop] = nil
 				}
 				dispatch_async(self.queue3) {
-					for i in 1...1000 {
+					for i in 1...10 {
 						let prop: String = String(i)
 						a1!.addGroup(prop)
 						a1!.addGroup("test")

			}
			
			dispatch_async(self.queue2) {
				for i in 1...500 {
					let prop: String = String(i)
					a1!.removeGroup(prop)
					a1!.addGroup("test")

					}
					
					dispatch_async(self.queue4) {
						for i in 1...5 {
							let prop: String = String(i)
							a1!.removeGroup(prop)
							a1!.addGroup("test")
