@Test
public void test6() {
List<Range> ranges = getRanges(0,2, 2,3, 5,1);
SpanExtraction extr = new SpanExtraction(sent, ranges);
List<String> expected = split("B-field0 I-field0 B-field1 I-field1 I-field1 B-field2 O O O");
assertEquals(expected, extr.toBIOLayer());
extr = new SpanExtraction(sent, ranges, split("arg1 rel arg2"));
expected = split("B-arg1 I-arg1 B-rel I-rel I-rel B-arg2 O O O");
assertEquals(expected, extr.toBIOLayer());
}