static Pair<Bool, S> generalDefinitions_addMultiple(Collection<Pair<S>> list) {
  MultiMap<S, Pair<S>> mm = mechMultiMapPairsCI(generalDefinitions_listName());
  
  new LinkedHashMap toAdd;
  for (Pair<S> p : list)
    if (nempty(p.a) && nempty(p.b) && !mapPairB(f dropGlobalID, mm.get(p.a)).contains(p))
      toAdd.put(p.a, appendGlobalID(p.b));

  if (empty(toAdd))
    ret pair(false, "Nothing to do");
    
  addToMechMap(generalDefinitions_listName(), toAdd);
  ret pair(true, print(n2(toAdd, "definition") + " added"));
}

Began life as a copy of #1017007