week11 tweaks

Signed-off-by: Jim Pryor <profjim@jimpryor.net>

diff --git a/week11.mdwn b/week11.mdwn
index cc7af5e..f07157f 100644 (file)
--- a/week11.mdwn
+++ b/week11.mdwn
@@ -235,7 +235,7 @@ Moving upwards yet again would get us:
           siblings = [*; subtree 920; subtree 950]
        }, * filled by subtree 500'
 
-where `subtree 500'` refers to a tree built from a root node whose children are given by the list `[*; subtree 50; subtree 80]`, with `subtree 20` inserted into the `*` position. Moving upwards yet again would get us:
+where `subtree 500'` refers to a tree built from a root node whose children are given by the list `[*; subtree 50; subtree 80]`, with `subtree 20'` inserted into the `*` position. Moving upwards yet again would get us:
 
        {
           parent = None;
@@ -252,7 +252,7 @@ We haven't given you a real implementation of the tree zipper, but only a sugges
 
 ##Same-fringe using a tree zipper##
 
-Recall back in [[Assignment4]], we asked you to enumerate the "fringe" of a leaf-labeled tree. Both of these trees:
+Recall back in [[Assignment4]], we asked you to enumerate the "fringe" of a leaf-labeled tree. Both of these trees (here I *am* drawing the labels in the diagram):
 
            .                .
           / \              / \