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diff --git a/assignment4.mdwn b/assignment4.mdwn
index cfe621cd..9f566758 100644
--- a/assignment4.mdwn
+++ b/assignment4.mdwn
@@ -28,6 +28,8 @@ First, read this: [[Implementing trees]]
 
 <OL start=3>
 <LI>blah
+
+(See [[hints/Assignment 4 hint 3]] if you need some hints.)
 </OL>
 
 
@@ -80,5 +82,8 @@ If we gave you such a `Y1` and `Y2`, how would you implement the above definitio
 
 					
 <LI>(More challenging.) Using our derivation of Y from the [[Week2]] notes as a model, construct a pair `Y1` and `Y2` that behave in the way described.
+
+(See [[hints/Assignment 4 hint 4]] if you need some hints.)
+
 </OL>