svoid standalone_unpackGazelleConcepts(File unpackDir) {
  File conceptsArchive = newFile(unpackDir, "gazelle-concepts.zip");
  stream2file(mc().getResourceAsStream("/" + conceptsArchive.getName()), conceptsArchive);
  
  for (S path : filesInZipFile(conceptsArchive)) {
    S progID = regexpFirstGroup("(#[0-9]+)/concepts.structure.gz", path);
    if (progID == null) continue with warn("Bad file name: " + path);
    print("Overwriting concepts of " + progID);
    clearConceptsOf(progID);
    extractFileFromZip(conceptsArchive, path, javaxDataDir(path));
  }
}