From 31305266a416d5b0c04ff44a63cb480c5e5bf881 Mon Sep 17 00:00:00 2001
From: Philip Wadler <wadler@inf.ed.ac.uk>
Date: Fri, 25 Oct 2019 18:51:39 +0100
Subject: [PATCH] Assignment 4

---
 Notes.md | 10 ++++++++++
 1 file changed, 10 insertions(+)

diff --git a/Notes.md b/Notes.md
index cc5d51f0..0b6dbbc4 100644
--- a/Notes.md
+++ b/Notes.md
@@ -4,6 +4,16 @@ title: Notes
 permalink: /Notes/
 ---
 
+## To Do
+
+Changes I would like to make to the book:
+- Relations, exercise `o+o≡e` --> (recommended)
+- Relations, exercise `≤-iff-<` --> `≤→<`, `<→≤`
+- Relations, exercise `Bin-predicates` --> `Bin-predicate`
+  change canonical form of zero to be empty string, `<>`.
+  Similar change to subsequent exercise.
+
+
 ## Downloading older versions
 
 <https://github.com/plfa/plfa.github.io/releases>