static L<S> downloadedDiagramStructures() {
  ret downloadedDiagramStructures(listFilesOfProgram_notDirs(#1010484));
}

static L<S> downloadedDiagramStructures(L<File> files) {
  new L<S> diagrams;
  for (File f : files) {
    if (!isPossibleMD5(f.getName()) || !f.isFile()) continue;
    print(f);
    if (fileStartsWith(f, toUtf8("CirclesAndLines"))) {
      print("Diagram!");
      diagrams.add(loadTextFile(f));
    } else if (isGZ(f)) {
      //print("GZipped!");
      S text = loadGZippedTextFile(f);
      if (isQuoted(firstJavaToken(text)))
        diagrams.addAll(scanQuotedLogLines(text));
      else {
        Concepts c = new Concepts().loadGrab(text, true);
        L<S> structures = getFieldOfAllConceptClasses(c, 'calStructure);
        print("Got " + n(structures, "diagram"));
        diagrams.addAll(structures);
      }
    } else
      print("Huh?");
  }
  ret diagrams;
}