static L parseToFragmentsUsingWordTree(S input, MapSO wordTree) {
  LS tok = javaTok(input);
  new L out;
  int i = 1;
  Pair<IntRange, O> p;
  while ping ((p = findUsingWordTree(tok, wordTree, i)) != null) {
    int j = p.a.start;
    if (j > i)
      out.add(Fragment(joinSubList(tok, i, j-1)));
    out.add(p.b);
    i = max(p.a.end, i+2); // up to i+2 just for safety
  }
  if (i < l(tok)-1)
    out.add(Fragment(joinSubList(tok, i)));
  ret out;
}