// modifies & denaturalizes the tokens (breaks connection with full text)
static L<TokenAndRange> ai_addDollarSignToCertainTokens_withRanges(L<TokenAndRange> tokens, final Set<S> set) {
  for (TokenAndRange t : tokens)
    if (contains(set, t.token))
      t.token = stringToDollarVar1(t.token);
  ret tokens;
}