diff --git a/read_data.py b/read_data.py
index 3cec2b4..1cd04d9 100644
--- a/read_data.py
+++ b/read_data.py
@@ -165,8 +165,7 @@ if __name__ == "__main__":
     def getTags(lst: List[Sentence]):
         for s in tqdm(lst):
             for e in s.detail:
-                if not e in vocab:
-                    vocab.add(e)
+                vocab.add(e)
     print("get tags from train...")
     getTags(train)
     print("get tags from dev...")
@@ -183,6 +182,7 @@ if __name__ == "__main__":
         v:str = "-".join(s)
         if not v in vocab:
             print("could not found pair " ,v)
+            vocab.add(v)
 
     tags = [{"name":"[PAD]","index":0}]
     i = 1