*/
  @Override
  public Comparator<? super K> comparator() {
    return keySet().comparator();
  }

  @Override
  public K firstKey() {
    return keySet().first();
  }

  @Override
  public K lastKey() {
    return keySet().last();
  }

  private ImmutableSortedMap<K, V> getSubMap(int fromIndex, int toIndex) {

count++;}else{if(count===1){const deltaY=horizontalSweepEdges[j].value-
horizontalSweepEdges[firstRect].value;area+=deltaX*deltaY;}
count--;}}}
active[currentLine.id]=(currentLine.type==='left');}