diff --git a/README.md b/README.md
index d703b45..db4c830 100644
--- a/README.md
+++ b/README.md
@@ -39,7 +39,7 @@ Example:
 ```python3
 >>> from daidepp import AND, PRP, PCE
 >>> str(AND(PRP(PCE("AUS")), PRP(PCE("AUS", "ENG"))))
-`AND ( ( PRP ( PCE ( AUS ) ) ) ( PRP ( PCE ( AUS ENG ) ) ) ( PRP ( PCE ( AUS ENG FRA ) ) ) )`
+`AND ( PRP ( PCE ( AUS ) ) ) ( PRP ( PCE ( AUS ENG ) ) ) ( PRP ( PCE ( AUS ENG FRA ) ) )`
  ```
 Each class in `keywords.py` uses different parameters for instantiation, so it is recommended to carefully follow the type hints or checkout `tests/test_keywords.py`, which provides examples for each class. 
 
diff --git a/src/daidepp/keywords.py b/src/daidepp/keywords.py
index 9e1e7ed..be38858 100644
--- a/src/daidepp/keywords.py
+++ b/src/daidepp/keywords.py
@@ -300,7 +300,7 @@ def __init__(self, *arrangements):
 
     def __str__(self):
         arr_str = ["( " + str(arr) + " )" for arr in self.arrangments]
-        return f"AND ( " + " ".join(arr_str) + " )"
+        return f"AND " + " ".join(arr_str)
 
 
 @dataclass
@@ -312,7 +312,7 @@ def __init__(self, *arrangements):
 
     def __str__(self):
         arr_str = ["( " + str(arr) + " )" for arr in self.arrangments]
-        return f"ORR ( " + " ".join(arr_str) + " )"
+        return f"ORR " + " ".join(arr_str)
 
 
 @dataclass
diff --git a/tests/test_keywords.py b/tests/test_keywords.py
index 079f054..d82a484 100644
--- a/tests/test_keywords.py
+++ b/tests/test_keywords.py
@@ -256,23 +256,23 @@ def test_DMZ():
 
 def test_AND():
     and_1 = AND(PRP(PCE("AUS")), PRP(PCE("AUS", "ENG")))
-    assert str(and_1) == "AND ( ( PRP ( PCE ( AUS ) ) ) ( PRP ( PCE ( AUS ENG ) ) ) )"
+    assert str(and_1) == "AND ( PRP ( PCE ( AUS ) ) ) ( PRP ( PCE ( AUS ENG ) ) )"
 
     and_2 = AND(PRP(PCE("AUS")), PRP(PCE("AUS", "ENG")), PRP(PCE("AUS", "ENG", "FRA")))
     assert (
         str(and_2)
-        == "AND ( ( PRP ( PCE ( AUS ) ) ) ( PRP ( PCE ( AUS ENG ) ) ) ( PRP ( PCE ( AUS ENG FRA ) ) ) )"
+        == "AND ( PRP ( PCE ( AUS ) ) ) ( PRP ( PCE ( AUS ENG ) ) ) ( PRP ( PCE ( AUS ENG FRA ) ) )"
     )
 
 
 def test_ORR():
     orr_1 = ORR(PRP(PCE("AUS")), PRP(PCE("AUS", "ENG")))
-    assert str(orr_1) == "ORR ( ( PRP ( PCE ( AUS ) ) ) ( PRP ( PCE ( AUS ENG ) ) ) )"
+    assert str(orr_1) == "ORR ( PRP ( PCE ( AUS ) ) ) ( PRP ( PCE ( AUS ENG ) ) )"
 
     orr_2 = ORR(PRP(PCE("AUS")), PRP(PCE("AUS", "ENG")), PRP(PCE("AUS", "ENG", "FRA")))
     assert (
         str(orr_2)
-        == "ORR ( ( PRP ( PCE ( AUS ) ) ) ( PRP ( PCE ( AUS ENG ) ) ) ( PRP ( PCE ( AUS ENG FRA ) ) ) )"
+        == "ORR ( PRP ( PCE ( AUS ) ) ) ( PRP ( PCE ( AUS ENG ) ) ) ( PRP ( PCE ( AUS ENG FRA ) ) )"
     )