static L<S> downloadedTypicalDiagramStructures() {
  SS map = safeUnstructureMap(loadTextFile(getProgramFile(#1010484, "typical.structure")));
  if (map == null) ret ll();
  ret downloadedDiagramStructures(map(values(map), func(S md5) -> File { getProgramFile(#1010484, md5) }));
}