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static Pair<Bool, S> generalDefinitions_remove(S word, S def) {
  if (empty(word) || empty(def)) ret pair(false, "Empty");
  
  L<Pair<S>> defs = mechMultiMapPairsCI(generalDefinitions_listName()).get(word);
  new SS globalIDs;
  for (Pair<S> p : defs)
    if (eqic(dropGlobalID(p.b), def))
      globalIDs.put(getAppendedGlobalID(p.b), dropGlobalID(p.b));
  if (empty(globalIDs))
    ret pair(false, "Definition not there");
    
  for (S id, text : globalIDs) {
    addToMechMap(generalDefinitions_listName(),
      litmap(word, appendGlobalID("[invalidate " + id + ": " + text + "]")));
  }
  ret pair(true, "Definition removed " + n2(globalIDs, "time") + ": " + word + " = " + def);
}