RegexExtractor r3 = new RegexExtractor("to_tok go_tok to_tok");
e1 = new ExtractorUnion<ChunkedSentence, ChunkedExtraction>();
e1.addExtractor(r1);
e1.addExtractor(r2);
e1.addMapper(new MergeOverlappingMapper());
e2 = new ExtractorUnion<ChunkedSentence, ChunkedExtraction>();
e2.addExtractor(r1);
e2.addExtractor(r3);
e2.addMapper(new MergeOverlappingMapper());
e3 = new ExtractorUnion<ChunkedSentence, ChunkedExtraction>();
e3.addExtractor(r2);
e3.addExtractor(r3);
e3.addMapper(new MergeOverlappingMapper());
}