* @return a List of Strings corresponding to sentences in the input
* string
*/
private static List<String> getSentences(String input, int start, int stop) {
Chunking chunking = CHUNKER.chunk(input.toCharArray(), start, stop);
Set<Chunk> sentences = chunking.chunkSet();
String slice = chunking.charSequence().toString();
List<String> result = new ArrayList<String>(sentences.size());
for(Chunk c: sentences) {
result.add(slice.substring(c.start(), c.end()));