diff --git a/TODO b/TODO
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--- a/TODO
+++ b/TODO
@@ -1,2 +1,7 @@
 # https://www.amazon.com/Puzzle-Day-Acrylic-Original-Challenges/dp/B0BNRSLTG5?th=1
 The acrylic version of the puzzle has colors for the pieces.  Perhaps change our colors to match?
+
+
+Techincally you can reach all possible orientations & flips of a piece in just three bytes (instead of four).
+A flip horizontally & vertically is identical to a 180 degree rotation, for example.
+You can probably get away with just a horizontal flip and then 0,90,180,270 for a total of three bytes.