Remove duplication.
diff --git a/Lib/turtle.py b/Lib/turtle.py
index 8fb366a..420b552 100644
--- a/Lib/turtle.py
+++ b/Lib/turtle.py
@@ -96,7 +96,7 @@
   docstrings to disc, so it can serve as a template for translations.
 
 Behind the scenes there are some features included with possible
-extensions in in mind. These will be commented and documented elsewhere.
+extensions in mind. These will be commented and documented elsewhere.
 
 """