!7

p {
  File in = new File("/home/stefan/dev/ip-to-country.csv");
  long last = 0;
  new StringBuilder buf;
  for (S s : linesFromReader(utf8BufferedReader(in))) {
    L<S> l = tok_splitAtComma_unquote(s);
    if (l(l) < 3) continue;
    long start = ipToInt(first(l));
    S country = last(l);
    S line = (start-last) + " " + country;
    print(line);
    buf.append(line + "\n");
    last = start;
  }
  File out = new File(f2s(in) + ".short.gz");
  saveGZTextFile(out, str(buf));
}