svoid nla_parse(NLABlock nla) {
  // parse into lines
  if (nla.lines == null)
    nla.lines = tlft(nla.text);
    
  // get entities
  if (nla.entities == null) {
    new Matches m;
    for (S s : nla.lines)
      if "There is...|there are..."
        m.entities.add(m.rest());
  }
}