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original.java

public synchronized boolean remove(Marker markerToRemove) {
  if (children == null) {
    return false;
  }

  int size = children.size();
  for (int i = 0; i < size; i++) {
    Marker m = (Marker) children.get(i);
    if (markerToRemove.equals(m)) {
      children.remove(i);
      return true;
    }
  }
  
  return false;
}

modified.java

public synchronized boolean remove(Marker referenceToRemove) {
  if (refereceList == null) {
    return false;
  }

  int size = refereceList.size();
  for (int i = 0; i < size; i++) {
    Marker m = (Marker) refereceList.get(i);
    if (referenceToRemove.equals(m)) {
      refereceList.remove(i);
      return true;
    }
  }
  return false;
}