Update.

diff --git a/grid.py b/grid.py
index bddda6d..08ca225 100755 (executable)
--- a/grid.py
+++ b/grid.py
@@ -3,6 +3,7 @@
 # Any copyright is dedicated to the Public Domain.
 # https://creativecommons.org/publicdomain/zero/1.0/
 
+
 # Written by Francois Fleuret <francois@fleuret.org>
 
 # This code implement a simple system to manipulate formal