class PerKari {
    public static void main (String[] arg) {
	Thread per = new Thread(new Per());
	Thread kari = new Thread(new Kari());
	per.start();  
	kari.start();
	System.out.println("Det var det.");
    }
}

class Per implements Runnable {
    @Override
    public void run () {
	System.out.println("Hei, jeg er Per.");
    }
}

class Kari implements Runnable {
    @Override
    public void run () {
	System.out.println("Hei, jeg er Kari.");
    }
}