static LS ai_splitConjoinedRules(LS l) {
  new LS out;
  for (S s : unnull(l)) {
    LS split = splitAtDoubleArrow(javaTokWithBrackets(s));
    if (l(split) > 2 && containsDoubleArrowAtBeginningOfLine(s)) {
      for (int i = 0; i < l(split)-1; i++)
        out.add(split.get(i) + "\n=> " + split.get(i+1));
    } else
      out.add(s);
  }
  ret out;
}