Remove duplication.
diff --git a/Demo/threads/sync.py b/Demo/threads/sync.py
index 843767a..a344abe 100644
--- a/Demo/threads/sync.py
+++ b/Demo/threads/sync.py
@@ -265,7 +265,7 @@
# intervening. If there are other threads waiting to write, they
# are allowed to proceed only if the current thread calls
# .read_out; threads waiting to read are only allowed to proceed
-# if there are are no threads waiting to write. (This is a
+# if there are no threads waiting to write. (This is a
# weakness of the interface!)
import thread
diff --git a/Demo/tix/tixwidgets.py b/Demo/tix/tixwidgets.py
index de2e22e..3cf34b7 100644
--- a/Demo/tix/tixwidgets.py
+++ b/Demo/tix/tixwidgets.py
@@ -659,7 +659,7 @@
I have implemented a new image type called "compound". It allows you
to glue together a bunch of bitmaps, images and text strings together
to form a bigger image. Then you can use this image with widgets that
-support the -image option. For example, you can display a text string string
+support the -image option. For example, you can display a text string
together with a bitmap, at the same time, inside a TK button widget.
""")
list.pack(expand=1, fill=Tix.BOTH, padx=4, pady=6)