static void bootstrapConceptsFrom(S progID) {
  for (S ending : ll("", ".gz")) {
    File f1 = getProgramFile(progID, "concepts.structure" + ending);
    File f2 = getProgramFile(programID(), "concepts.structure" + ending);
    if ((!f2.exists() || eq(ending, ".gz") && fileSize(f2) <= 24) && f1.exists())
      copyFile(f1, f2);
  }
}