Behaviour Pattern

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#!/bin/bash

echo "Hello world!"

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#include <stdio.h>

int main(void) {
  printf("Hello world!\n");
}

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#include <iostream>

int main() {
  std::cout << "Hello world!" << std::endl;
  return 0;
}

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using System;

class Program {
  static void Main(string[] args) {
    Console.WriteLine("Hello world!");
  }
}