No need to register classes that already inherit from ABCs.
diff --git a/Lib/UserList.py b/Lib/UserList.py
index 17f45c8..556a327 100644
--- a/Lib/UserList.py
+++ b/Lib/UserList.py
@@ -85,5 +85,3 @@
self.data.extend(other.data)
else:
self.data.extend(other)
-
-collections.MutableSequence.register(UserList)
diff --git a/Lib/UserString.py b/Lib/UserString.py
index 71984a7..94fcbd2 100755
--- a/Lib/UserString.py
+++ b/Lib/UserString.py
@@ -214,8 +214,6 @@
def insert(self, index, value):
self[index:index] = value
-collections.MutableSequence.register(MutableString)
-
if __name__ == "__main__":
# execute the regression test to stdout, if called as a script:
import os