static bool cal_dropSecondaryLabels(CirclesAndLines cal) {
  bool change = false;
  for (Circle c : cal.circles)
    if (l(c.traits) > 1) { c.setText(c.text); change = true; }
  for (Line l: cal.lines)
    if (l(l.traits) > 1) { l.setText(l.text); change = true; }
  ret change;
}