static ActualThoughtSpace openThoughtSpaceFromDB(S name) {
  S prefix = "[" + deSquareBracket(trim(name)) + "] ";
  Collection<S> terms = allIndexedFullTermsStartingWith(prefix);
  ActualThoughtSpace ts = newThoughtSpace();
  for (S rel : terms)
    for (TripleWeb w : ai_globalTriplesWithB(rel))
      postDerived(w, w.a, dropPrefix(prefix, w.b), w.c);
  ret ts;
}