static Pair<LS, Map<Int>> ai_parseTokenRefNumbers(LS tok) {
  tok = tok_combineSquareBrackets_keep(tok);
  new LS out;
  new Map<S, Int> refToToken;
  new Map<Int> map;
  for i over tok: {
    S t = tok.get(i);
    if (odd(i) && isSquareBracketed(t)) {
      t = deSquareBracket(t);
      if (startsWith(t, "*"))
        refToToken.put(dropFirst(t), l(out)-2);
      else
        mapPut(map, l(out)-2, refToToken.get(t));
      ++i;
    } else
      out.add(t);
  }
  ret pair(out, map);
}