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public class Main {
	public static void main(String[] args) {
		String result = tasks();
		System.out.println(result);
	}

	private static String tasks(){
		TestLibrary lib = new TestLibrary();

		final String[] result = new String[1];

		lib.firstTask(new Task() {
			@Override
			public void taskCallback(String s) {
				 result[0] = lib.secondTask(s);
			}
		});

		// FIXME always null.
		return result[0];
	}
}