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class CrearThread2 {
 
    public static void main(String args[]) {
    Thread t1 = new Thread(new Interna1());
    Thread t2 = new Thread(new Interna2());
 
    t1.start();
    t2.start();
    try {
        t1.join();
        t2.join();
    }
    catch (InterruptedException ie) { }
    }
    
}