Remove duplication.
diff --git a/Doc/reference/compound_stmts.rst b/Doc/reference/compound_stmts.rst
index 8151a0a..e7a6f18 100644
--- a/Doc/reference/compound_stmts.rst
+++ b/Doc/reference/compound_stmts.rst
@@ -478,7 +478,7 @@
**Default parameter values are evaluated when the function definition is
executed.** This means that the expression is evaluated once, when the function
-is defined, and that that same "pre-computed" value is used for each call. This
+is defined, and that the same "pre-computed" value is used for each call. This
is especially important to understand when a default parameter is a mutable
object, such as a list or a dictionary: if the function modifies the object
(e.g. by appending an item to a list), the default value is in effect modified.