static Web calToWeb(CirclesAndLines cal) {
  new Web web;
  web.useCLParse = false;
  new HashMap<Circle, WebNode> map;
  for (Circle c : cal.circles)
    map.put(c, web.newNode(c.text));
  for (Line l : cal.lines) {
    WebNode rel = web.getRelation(assertNotNull(map.get(l.a)), assertNotNull(map.get(l.b)));
    rel.addLabel(l.text);
  }
  ret web;
}