def printit():
    print("""
    
    
    
    #include "ns3/core-module.h"
    #include "ns3/network-module.h"
    #include "ns3/internet-module.h"
    #include "ns3/point-to-point-module.h"
    #include "ns3/applications-module.h"
    
    using namespace ns3;
    
    NS_LOG_COMPONENT_DEFINE ("FirstScriptExample");
    
    int
    main (int argc, char *argv[])
    {
      CommandLine cmd;
      cmd.Parse (argc, argv);
    
      LogComponentEnable ("UdpEchoClientApplication", LOG_LEVEL_INFO);
      LogComponentEnable ("UdpEchoServerApplication", LOG_LEVEL_INFO);
    
      NodeContainer nodes;
      nodes.Create (2);
    
      PointToPointHelper pointToPoint;
      pointToPoint.SetDeviceAttribute ("DataRate", StringValue ("5Mbps"));
      pointToPoint.SetChannelAttribute ("Delay", StringValue ("2ms"));
    
      NetDeviceContainer devices;
      devices = pointToPoint.Install (nodes);
    
      InternetStackHelper stack;
      stack.Install (nodes);
    
      Ipv4AddressHelper address;
      address.SetBase ("10.1.1.0", "255.255.255.0");
    
      Ipv4InterfaceContainer interfaces = address.Assign (devices);
    
      UdpEchoServerHelper echoServer (9);
    
      ApplicationContainer serverApps = echoServer.Install (nodes.Get (1));
      serverApps.Start (Seconds (1.0));
      serverApps.Stop (Seconds (10.0));
    
      UdpEchoClientHelper echoClient (interfaces.GetAddress (1), 9);
      echoClient.SetAttribute ("MaxPackets", UintegerValue (1));
      echoClient.SetAttribute ("Interval", TimeValue (Seconds (1.0)));
      echoClient.SetAttribute ("PacketSize", UintegerValue (1024));
    
      ApplicationContainer clientApps = echoClient.Install (nodes.Get (0));
      clientApps.Start (Seconds (2.0));
      clientApps.Stop (Seconds (10.0));
    
      Simulator::Run ();
      Simulator::Destroy ();
      return 0;
    }
    
    
    
    """)