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static L xtok_ampersand(L l) {
  int i = indexOfSubList(l, "&", "", "&");
  if (i < 2 || i+4 >= l(l)) ret l; // must have stuff on left and right
  if (l(l) == 9) ret l; // already in best shape
  new L x;
  x.add(l.get(0));
  if (i == 2) x.add(l.get(1)); else x.add(cncComplete(subList(l, 1, i-1)));
  x.addAll(subList(l, i-1, i+4));
  if (i+6 == l(l)) x.add(l.get(i+4)); else x.add(cncComplete(subList(l, i+4, l(l)-1)));
  x.add(last(l));
  ret x;
}