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diff --git a/topics/week4_fixed_point_combinators.mdwn b/topics/week4_fixed_point_combinators.mdwn
index 601ad813..b20212d6 100644
--- a/topics/week4_fixed_point_combinators.mdwn
+++ b/topics/week4_fixed_point_combinators.mdwn
@@ -553,9 +553,9 @@ then this is a fixed-point combinator:
 For those of you who like to watch ultra slow-mo movies of bullets
 piercing apples, here's a stepwise computation of the application of a
 recursive function.  We'll use a function `sink`, which takes one
-argument.  If the argument is boolean true (i.e., `\x y. x`), it
+argument.  If the argument is boolean true (i.e., `\y n. y`), it
 returns itself (a copy of `sink`); if the argument is boolean false
-(`\x y. y`), it returns `I`.  That is, we want the following behavior:
+(`\y n. n`), it returns `I`.  That is, we want the following behavior:
 
     sink false <~~> I
     sink true false <~~> I