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    private void listen(int port) throws IOException {
        ss = new ServerSocket(port);
        System.out.println("Listening on " + ss);
        while (true) {
            Socket s = ss.accept();
            System.out.println("Connection from " + s.getLocalAddress().getHostName());
            DataOutputStream dout = new DataOutputStream(s.getOutputStream());
            outputStreams.put(s, dout);
            System.out.println(""+dout);
            new ServerThread(this, s, id);
        }
    }