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diff --git a/assignment1.mdwn b/assignment1.mdwn
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+++ b/assignment1.mdwn
@@ -96,11 +96,11 @@
 
 *   Write a function `unmap2` that is something like the inverse of `map2`. This function expects two arguments, the second being a sequence of elements of some type *t*. The first is a function `g` that expects a single argument of type *t* and returns a *pair* of results, rather than just one result. We want to collate these results, the first into one list, and the second into a different list. Then `unmap2` should return those two lists. Thus if:
 
-        g x1  # evaluates to [y1, z1]
-        g x2  # evaluates to [y2, z2]
-        g x3  # evaluates to [y3, z3]
+        g z1  # evaluates to [x1, y1]
+        g z2  # evaluates to [x2, y2]
+        g z3  # evaluates to [x3, y3]
 
-    Then `unmap2 (g, [x1, x2, x3])` should evaluate to `([y1, y2, y3], [z1, z2, z3])`.
+    Then `unmap2 (g, [z1, z2, z3])` should evaluate to `([x1, x2, x3], [y1, y2, y3])`.
 
 *   Write a function `takewhile` that expects a `p` argument like `filter`, and also a sequence. The result should behave like this: