diff --git a/src/main/antlr/CollectionQuery.g4 b/src/main/antlr/CollectionQuery.g4
index 7aad659..2c6b29b 100644
--- a/src/main/antlr/CollectionQuery.g4
+++ b/src/main/antlr/CollectionQuery.g4
@@ -65,6 +65,7 @@
 
 expr
 :	(value operator)? field operator value
+//|	LRB expr RRB
 ;
 	
 field
@@ -78,18 +79,10 @@
 | regex
 ;
 
-/*	
-andGroup
-: 	(((LRB exprGroup RRB)|expr) AND)+ ((LRB exprGroup RRB)|expr)
-;
-
-orGroup
-: 	(((LRB exprGroup RRB)|expr) OR)+ ((LRB exprGroup RRB)|expr)
-;
-*/
 
 relation
 :	(expr|exprGroup) conj (expr|exprGroup|relation)
+//|	LRB relation RRB
 ; 
 
 exprGroup
@@ -98,6 +91,6 @@
 
 start
 :	( expr 
-	| exprGroup EOF 
-	| relation EOF ) 
+	| exprGroup 
+	| relation  ) 
 ;
\ No newline at end of file