diff --git a/src/main/java/de/ids_mannheim/korap/query/serialize/CosmasTree.java b/src/main/java/de/ids_mannheim/korap/query/serialize/CosmasTree.java
index 58a5611..89de56f 100644
--- a/src/main/java/de/ids_mannheim/korap/query/serialize/CosmasTree.java
+++ b/src/main/java/de/ids_mannheim/korap/query/serialize/CosmasTree.java
@@ -257,16 +257,36 @@
 			}
 		}
 		
-		// negate every token that's under OPNOT > ARG2
-		if (nodeCat.equals("ARG2") && openNodeCats.get(1).equals("OPNOT")) {
-			negate = true;
+//		// negate every token that's under OPNOT > ARG2
+//		if (nodeCat.equals("ARG2") && openNodeCats.get(1).equals("OPNOT")) {
+//			negate = true;
+//		}
+		
+		if (nodeCat.equals("ARG1") || nodeCat.equals("ARG2")) {
+			if (node.getChildCount()>1) {
+				// Step I: create sequence
+				LinkedHashMap<String, Object> sequence = new LinkedHashMap<String, Object>();
+				sequence.put("@type", "korap:sequence");
+				sequence.put("operands", new ArrayList<Object>());
+				objectStack.push(sequence);
+				stackedObjects++;
+				// Step II: decide where to put sequence
+				if (objectStack.size()>1) {
+					ArrayList<Object> topObjectOperands = (ArrayList<Object>) objectStack.get(1).get("operands");
+					topObjectOperands.add(sequence);
+				} else {
+					requestMap.put("query", sequence);
+				}
+			}
 		}
 		
-		if (nodeCat.equals("OPOR") || nodeCat.equals("OPAND")) {
+		if (nodeCat.equals("OPOR") || nodeCat.equals("OPAND") || nodeCat.equals("OPNOT")) {
 			// Step I: create group
 			LinkedHashMap<String, Object> disjunction = new LinkedHashMap<String, Object>();
 			disjunction.put("@type", "korap:group");
-			String relation = nodeCat.equals("OPOR") ? "or" : "and";
+			String relation = "or";
+			if (nodeCat.equals("OPAND")) relation = "and";
+			if (nodeCat.equals("OPNOT")) relation = "not";
 			disjunction.put("relation", relation);
 			disjunction.put("operands", new ArrayList<Object>());
 			objectStack.push(disjunction);
@@ -428,7 +448,8 @@
 				"Sonne nicht (Mond Stern)",
 				"Sonne /+w1:4 Mond",
 //				"wegen #IN(L) <s>"
-				"#BEG(<s>) /5w,s0 #END(<s>)"
+				"#BEG(<s>) /5w,s0 #END(<s>)",
+				
 				};
 		CosmasTree.debug=true;
 		for (String q : queries) {
diff --git a/src/test/java/CosmasTreeTest.java b/src/test/java/CosmasTreeTest.java
index e4d8c5a..9af11af 100644
--- a/src/test/java/CosmasTreeTest.java
+++ b/src/test/java/CosmasTreeTest.java
@@ -101,19 +101,35 @@
 	@Test
 	public void testOPIN() {
 		query="wegen #IN(L) <s>";
-		String disj1 = 
+		String opin1 = 
 					"{@type=korap:group, relation=in, position=L, operands=[" +
 						"{@type=korap:token, @value={@type=korap:term, @value=orth:wegen, relation==}}," +
 						"{@type=korap:element, @value=s}" +
 					"]}";
 		ppt = new CosmasTree(query);
 		map = ppt.getRequestMap().get("query").toString();
-		assertEquals(disj1.replaceAll(" ", ""), map.replaceAll(" ", ""));
+		assertEquals(opin1.replaceAll(" ", ""), map.replaceAll(" ", ""));
 	}
 	
 	@Test
 	public void testOPNOT() {
-		
+		query="Sonne nicht Mond";
+		String opnot1 = 
+					"{@type=korap:group, relation=not, operands=[" +
+						"{@type=korap:token, @value={@type=korap:term, @value=orth:Sonne, relation==}}," +
+						"{@type=korap:token, @value={@type=korap:term, @value=orth:Mond, relation==}}" +
+					"]}";
+		ppt = new CosmasTree(query);
+		map = ppt.getRequestMap().get("query").toString();
+		assertEquals(opnot1.replaceAll(" ", ""), map.replaceAll(" ", ""));
+	}
+	
+	@Test
+	public void testBEG_END() {
+		// BEG and END operators
+		// http://www.ids-mannheim.de/cosmas2/web-app/hilfe/suchanfrage/eingabe-zeile/syntax/links.html
+		// http://www.ids-mannheim.de/cosmas2/web-app/hilfe/suchanfrage/eingabe-zeile/syntax/rechts.html
+		// http://www.ids-mannheim.de/cosmas2/web-app/hilfe/suchanfrage/eingabe-zeile/thematische-bsp/bsp-satzlaenge.html
 	}
 }