diff --git a/src/main/java/de/ids_mannheim/korap/KorapIndex.java b/src/main/java/de/ids_mannheim/korap/KorapIndex.java
index 8b43b19..e2d957c 100644
--- a/src/main/java/de/ids_mannheim/korap/KorapIndex.java
+++ b/src/main/java/de/ids_mannheim/korap/KorapIndex.java
@@ -104,6 +104,13 @@
  * @author ndiewald
  */
 public class KorapIndex {
+
+    // Todo: Use configuration
+    // Last line of defense for simple DOS attacks!
+    private int maxTermRelations = 100;
+    private int autoCommit = 500;
+
+
     private Directory directory;
 
     // Temp:
@@ -114,12 +121,10 @@
     private IndexSearcher searcher;
     private boolean readerOpen = false;
     private int commitCounter = 0;
-    private int autoCommit = 500; // Todo: Use configuration
     private HashMap termContexts;
     private ObjectMapper mapper = new ObjectMapper();
     private String version;
 
-    private int maxTermRelations = 50;
 
     private static ByteBuffer bb       = ByteBuffer.allocate(4),
 	                      bbOffset = ByteBuffer.allocate(8),
diff --git a/src/main/java/de/ids_mannheim/korap/KorapMatch.java b/src/main/java/de/ids_mannheim/korap/KorapMatch.java
index dc28449..5d398b2 100644
--- a/src/main/java/de/ids_mannheim/korap/KorapMatch.java
+++ b/src/main/java/de/ids_mannheim/korap/KorapMatch.java
@@ -1084,6 +1084,9 @@
 	LinkedList<int[]> openList  = new LinkedList<int[]>();
 	LinkedList<int[]> closeList = new LinkedList<int[]>();
 
+	// Filter multiple identifier
+	this._filterMultipleIdentifiers();
+
 	// Add highlight spans to balance lists
 	openList.addAll(this.span);
 	closeList.addAll(this.span);
@@ -1272,6 +1275,14 @@
 	    if (DEBUG)
 		log.trace("There are highlights!");
 
+	    /*
+Here maybe?
+	if (this.highlight.last.start = hl.start && this.highlight.end == hl.end && this.highlight.id < -1) {
+	    return;
+	};
+	*/
+
+	    
 	    for (Highlight highlight : this.highlight) {
 		int start = this.positionsToOffset.start(
 		  ldid, highlight.start
@@ -1342,4 +1353,35 @@
 
 	return "{}";
     };
+
+
+    // Remove duplicate identifiers
+    // Yeah ... I mean ... why not?
+    private void _filterMultipleIdentifiers () {
+	ArrayList<Integer> removeDuplicate = new ArrayList<>(10);
+	HashSet<Integer> identifiers = new HashSet<>(20);
+	for (int i = 0; i < this.span.size(); i++) {
+	    // span is an int array: [Start, End, Number, Dummy]
+	    int highlightNumber = this.span.get(i)[2];
+
+	    // number is an identifier
+	    if (highlightNumber < -1) {
+		int idNumber = identifierNumber.get(highlightNumber);
+		if (identifiers.contains(idNumber)) {
+		    removeDuplicate.add(i);
+		}
+		else {
+		    identifiers.add(idNumber);
+		};
+	    };
+	};
+
+	Collections.sort(removeDuplicate);
+	Collections.reverse(removeDuplicate);
+
+	// Delete all duplicate identifiers
+	for (int delete : removeDuplicate) {
+	    this.span.remove(delete);
+	};
+    };
 };
diff --git a/src/main/resources/log4j.properties b/src/main/resources/log4j.properties
index f48fe94..af72c2d 100644
--- a/src/main/resources/log4j.properties
+++ b/src/main/resources/log4j.properties
@@ -10,7 +10,7 @@
 #log4j.logger.de.ids_mannheim.korap.query.spans.NextSpans = TRACE, stdout
 #log4j.logger.de.ids_mannheim.korap.query.spans.SimpleSpans = TRACE, stdout
 # log4j.logger.de.ids_mannheim.korap.query.spans.ClassSpans = TRACE, stdout
-#log4j.logger.de.ids_mannheim.korap.query.spans.MatchSpans = TRACE, stdout
+# log4j.logger.de.ids_mannheim.korap.query.spans.MatchSpans = TRACE, stdout
 
 # Collections
 #log4j.logger.de.ids_mannheim.korap.KorapFilter = TRACE, stdout
diff --git a/src/test/java/de/ids_mannheim/korap/filter/TestKorapCollectionJSON.java b/src/test/java/de/ids_mannheim/korap/filter/TestKorapCollectionJSON.java
index bc8a5bb..a20c07b 100644
--- a/src/test/java/de/ids_mannheim/korap/filter/TestKorapCollectionJSON.java
+++ b/src/test/java/de/ids_mannheim/korap/filter/TestKorapCollectionJSON.java
@@ -49,6 +49,14 @@
 	assertEquals("filter with QueryWrapperFilter(+(+corpusID:d-1 +corpusID:d-2))",kc.getFilter(1).toString());
     };
 
+    @Test
+    public void metaQuery9 () {
+	String metaQuery = getString(getClass().getResource("/queries/metaquery9.jsonld").getFile());
+	KorapCollection kc = new KorapCollection(metaQuery);
+	assertEquals(1,kc.getCount());
+	assertEquals("filter with QueryWrapperFilter(+corpusID:WPD)",kc.getFilter(0).toString());
+    };
+
 
 
     public static String getString (String path) {
diff --git a/src/test/java/de/ids_mannheim/korap/index/TestMatchIdentifier.java b/src/test/java/de/ids_mannheim/korap/index/TestMatchIdentifier.java
index 51560d6..6481153 100644
--- a/src/test/java/de/ids_mannheim/korap/index/TestMatchIdentifier.java
+++ b/src/test/java/de/ids_mannheim/korap/index/TestMatchIdentifier.java
@@ -522,6 +522,66 @@
 		     km.getSnippetBrackets());
     };
 
+    @Test
+    public void indexExample7Dependencies () throws IOException {
+	KorapIndex ki = new KorapIndex();
+	ki.addDoc(createSimpleFieldDoc2());
+	ki.commit();
+
+	KorapMatch km = ki.getMatchInfo("match-c1!d1-p0-4",
+			     "tokens",
+			     null,
+			     null,
+			     true,
+			     true);
+
+
+	assertEquals("SnippetHTML (2)",
+		     "<span class=\"context-left\">" +
+		     "</span>" +
+		     "<span class=\"match\">"+
+		     "<span xlink:title=\"x/rel:a\" xlink:type=\"simple\" xlink:href=\"#word-c1!d1-p3\">"+
+		     "<span title=\"f/m:eins\">"+
+		     "<span title=\"f/y:one\">"+
+		     "<span title=\"it/is:1\">" +
+		     "<span title=\"x/o:erstens\">a</span>" +
+		     "</span>" +
+		     "</span>" +
+		     "</span>" +
+		     "</span>" +
+		     "<span xlink:title=\"x/rel:b\" xlink:type=\"simple\" xlink:href=\"#word-c1!d1-p3\">"+
+		     "<span title=\"f/m:zwei\">"+
+		     "<span title=\"f/y:two\">"+
+		     "<span title=\"it/is:2\">"+
+		     "<span title=\"x/o:zweitens\">b</span>"+
+		     "</span>"+
+		     "</span>"+
+		     "</span>"+
+		     "</span>"+
+		     "<span title=\"f/m:drei\">"+
+		     "<span title=\"f/y:three\">"+
+		     "<span title=\"it/is:3\">"+
+		     "<span title=\"x/o:drittens\">c</span>"+
+		     "</span>"+
+		     "</span>"+
+		     "</span>"+
+		     "<span xml:id=\"word-c1!d1-p3\">"+
+		     "<span title=\"f/m:vier\">"+
+		     "<span title=\"f/y:four\">"+
+		     "<span title=\"it/is:4\">"+
+		     "<span title=\"x/o:viertens\">a</span>"+
+		     "</span>"+
+		     "</span>"+
+		     "</span>"+
+		     "</span>"+
+		     "</span>"+
+		     "<span class=\"context-right\">"+
+		     "<span class=\"more\">"+
+		     "</span>"+
+		     "</span>",
+		     km.getSnippetHTML());
+    };
+    
     private FieldDocument createSimpleFieldDoc(){
 	FieldDocument fd = new FieldDocument();
 	fd.addString("corpusID", "c1");
@@ -540,4 +600,23 @@
 		 "[(9-10)s:c|i:c|f/m:zehn|f/y:ten|x/o:zehntens|it/is:10|_9#9-10]");
 	return fd;
     };
+
+    private FieldDocument createSimpleFieldDoc2(){
+	FieldDocument fd = new FieldDocument();
+	fd.addString("corpusID", "c1");
+	fd.addString("ID", "d1");
+	fd.addTV("tokens",
+		 "abcabcabac",
+		 "[(0-1)s:a|i:a|f/m:eins|f/y:one|x/o:erstens|it/is:1|>:x/rel:a$<i>4|_0#0-1|-:t$<i>10]" +
+		 "[(1-2)s:b|i:b|f/m:zwei|f/y:two|x/o:zweitens|it/is:2|>:x/rel:b$<i>4|_1#1-2]" +
+		 "[(2-3)s:c|i:c|f/m:drei|f/y:three|x/o:drittens|it/is:3|_2#2-3|<>:s#2-5$<i>5]" +
+		 "[(3-4)s:a|i:a|f/m:vier|f/y:four|x/o:viertens|it/is:4|<:x/rel:b$<i>1|_3#3-4]" +
+		 "[(4-5)s:b|i:b|f/m:fuenf|f/y:five|x/o:fünftens|it/is:5|_4#4-5]" +
+		 "[(5-6)s:c|i:c|f/m:sechs|f/y:six|x/o:sechstens|it/is:6|_5#5-6]" +
+		 "[(6-7)s:a|i:a|f/m:sieben|f/y:seven|x/o:siebtens|it/is:7|_6#6-7]" +
+		 "[(7-8)s:b|i:b|f/m:acht|f/y:eight|x/o:achtens|it/is:8|<>:x/tag#7-10$<i>10|_7#7-8]" +
+		 "[(8-9)s:a|i:a|f/m:neun|f/y:nine|x/o:neuntens|it/is:9|_8#8-9]" +
+		 "[(9-10)s:c|i:c|f/m:zehn|f/y:ten|x/o:zehntens|it/is:10|_9#9-10]");
+	return fd;
+    };
 };
diff --git a/src/test/java/de/ids_mannheim/korap/search/TestKorapSearch.java b/src/test/java/de/ids_mannheim/korap/search/TestKorapSearch.java
index 91a1717..ac89202 100644
--- a/src/test/java/de/ids_mannheim/korap/search/TestKorapSearch.java
+++ b/src/test/java/de/ids_mannheim/korap/search/TestKorapSearch.java
@@ -279,6 +279,12 @@
 	assertEquals(2, kr.getStartIndex());
 	assertEquals(2, kr.getItemsPerPage());
 
+
+	json = getString(getClass().getResource("/queries/metaquery9.jsonld").getFile());
+	KorapCollection kc = new KorapCollection(json);
+	kc.setIndex(ki);
+	assertEquals(7, kc.numberOf("documents"));
+	
     };
 
     @Test