private Instances splitCenters(Random random,
protected Instances splitCenters(Random random,
  private Instances splitCenters(Random random,				 Instances instances,				 Instances model) {    Instances children = new Instances(model, 2);    int instIndex = Math.abs(random.nextInt()) %       instances.numInstances();    children.add(instances.instance(instIndex));    int instIndex2 = instIndex;    int count = 0;    while ((instIndex2 == instIndex) && count < 10) {      count++;      instIndex2 = Math.abs(random.nextInt()) %	instances.numInstances();    }    children.add(instances.instance(instIndex2));        return children;  }