Goodbye World

   Goodbye world is a [1]program that is in some sense an opposite of the
   traditional [2]hello world program. What exactly this means is not
   strictly given, but some possibilities are:

     * It just prints goodbye world, the programmer writes the program and
       never touches the language again.
     * It is the last program a programmer writes before death, either
       unknowingly or possibly as a [3]suicide note.
     * Just as hello world shows the very basics of a language, a goodbye
       world may showcase the most advanced or masterful concepts of the
       language.
     * It is a program that erases itself or possibly the whole [4]operating
       system etc.
     * TODO: more ideas?

Links:
1. program.md
2. hello_world.md
3. suicide.md
4. os.md