week4 tweaks

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

diff --git a/week4.mdwn b/week4.mdwn
index 8353afb..49a2c1f 100644 (file)
--- a/week4.mdwn
+++ b/week4.mdwn
@@ -595,7 +595,7 @@ detail](http://okmij.org/ftp/Streams.html#enumerator-stream).
 >      
 >                      f a (f b (f c (f d (f e z))))
 >      
->      The left fold on the other hand starts combining `z` with elements from the left. `f z z` is then combined with `b`, and so on:
+>      The left fold on the other hand starts combining `z` with elements from the left. `f z a` is then combined with `b`, and so on:
 >      
 >                      f (f (f (f (f z a) b) c) d) e
 >