diff --git a/src/main/java/parser/Parser.java b/src/main/java/parser/Parser.java
index 85ee56c..e1ec458 100644
--- a/src/main/java/parser/Parser.java
+++ b/src/main/java/parser/Parser.java
@@ -21,12 +21,6 @@
     public static final String COLON = ":";
     public static final String DOUBLE_QUOT = "\"";
 
-    protected static List<ReferenceEdge> srcEdges = new ArrayList<>();
-    protected static List<ReferenceEdge> dstEdges = new ArrayList<>();
-    protected static Map<String, ObjectNode> objectNodeMap = new HashMap<>();
-    protected static PushPullValue transferStyle;
-    protected static MultiplicityValue multiplicityValue;
-
     public Parser() {
         Scanner sc = new Scanner(System.in);
         StringBuilder s = new StringBuilder();