// DO NOT RUN THIS! By inspection, how many times will it print "Hello
world"?
// If you find out by running it, that is cheating. Don't do it!
int main()
{
  int i=0, j=0;
  for(i = 0; i*j < 20; ++i)
  {
    if (fork() > 0) ++j;
    else i = j =  0;
    printf("Hello world\n");
  }
  return 0;
}

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