code: private List<Integer> getSubPicturesToBeExported() {
  		List<Integer> subPicturesToBeExported = new ArrayList<Integer>();
  		for (int i = 0; i < subPictures.length; i++) {
  			SubPicture subPicture = subPictures[i];
  			if (!subPicture.isExcluded()
  					&& (!configuration.isExportForced() || subPicture
  							.isForced())) {
  				subPicturesToBeExported.add(i);
  			}
  		}
  		return subPicturesToBeExported;
  	}
docs: Return indexes of subpictures to be exported.
  
  @return indexes of subpictures to be exported