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diff --git a/README.txt b/README.txt
index 4a5ca30..2934446 100644
--- a/README.txt
+++ b/README.txt
@@ -23,9 +23,10 @@ be solved but not by everybody.
 
 There are 5 competing GPTs.
 
-The "world" is a 7x9 grid with three "birds" moving in a straight line
+The "world" is a 6x8 grid with three "birds" moving in a straight line
 and bouncing on the world's borders. It could be another "world", but
-this one has objectness and motion.
+this one has objectness and motion. There are ten colors and 4
+directions of motions, so roughly (6x8x4x10)**3 ~ 7e9 states.
 
 Given a random world state, and the state after two iterations of
 birds moving, a "quiz" is to predict the second frame, given the
@@ -45,8 +46,8 @@ quizzes. To do so, it generates a large number of pairs of frames, and
 checks which ones of these quizzes are hard but not too hard, which
 means [THIS IS THE IMPORTANT BIT]:
 
-it can be solved, in both time directions, by all the other GPTs **but
-one**
+  it can be solved, in both time directions, by all the other GPTs
+  **but one**
 
 The both time directions is to avoid a simple type of quizzes which is
 simply to deal with noise in the first frame.