svoid ai_compressWikipedia(File articlesXMLFile, bool fullCompression default true) {
  long total = l(articlesXMLFile);
  int step = oneHundredMillion();
  long i = 0;
  while (i < total) {
    File out = appendToFileName(articlesXMLFile, "-" + i + (fullCompression ? ".fubc" : ".ubc"));
    if (!fileExists(out))
      lcCompressFilePart_upper(articlesXMLFile, out, i, step, +fullCompression);
    i += step;
  }
}