static LS pAttractor_allMatches(PartialAttractor a, LS tok) {
  int i = 0;
  new LS out;
  while (licensed() && i < l(tok)) {
    a.tok = subList(tok, i);
    if (!a.find()) break;
    assertTrue("match must not be empty", a.matchedRange.end >= 2);
    out.add(a.matchedString());
    i += a.matchedRange.end & ~1; // go to next N token
  }
  ret out;
}