} if (debugPrune) { numPrePruned = numPruned = 0;
  protected void clear() {    totalItems = 0;    if (debugNumItemsGenerated) {      totalItemsGenerated = 0;    }    for (int i = 0; i < size; i++)      for (int j = i; j < size; j++)	if (chart[i][j] == null)	  chart[i][j] = new Entry();	else	  chart[i][j].clear();  }