From 484c0744fb8615a6bad401b4ff62c38d647e8635 Mon Sep 17 00:00:00 2001
From: Andrew Ekstedt <andrew.ekstedt@gmail.com>
Date: Sat, 9 Dec 2023 07:15:58 +0000
Subject: [PATCH] add a note

---
 day09/sol.tcl | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/day09/sol.tcl b/day09/sol.tcl
index 05c8641..b0af115 100755
--- a/day09/sol.tcl
+++ b/day09/sol.tcl
@@ -26,6 +26,8 @@ proc predict {lst} {
 }
 
 proc unpredict {lst} {
+    # note: this could be
+    #   return [predict [lreverse $lst]]
     if {[allzeros $lst]} {
         return 0
     }