{ # closure for getNewDrawBall, getNewNonDrawBall
  my %seen;

  sub clearNewDrawBallCache
  {
    %seen = ();
  }

  sub getNewDrawBall
  {
    # stuff here
  }

  sub getNewNonDrawBall
  {
    # stuff here
  }
} # end closure for getNewDrawBall, getNewNonDrawBall