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static Collection<S> getCodeFragmentSafety(S code) {
  SS map = mechMap("JavaX Identifier Safety");
  Set<S> identifiers = tok_allIdentifiers(code);
  
  Collection<S> tags = treeSet();
  for (S id : identifiers) {
    S tag = or2(map.get(id), "?");
    tags.addAll(tokSplitAtComma(tags));
  }
  
  tags = simplifySafetyTags(tags);
  if (empty(tags)) tags.add("?");
  ret tags;
}