fix tattoo

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

diff --git a/week3.mdwn b/week3.mdwn
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--- a/week3.mdwn
+++ b/week3.mdwn
@@ -424,7 +424,7 @@ to *the tail* of the list we were evaluating its application to at the previous
 
 ##Fixed-point Combinators Are a Bit Intoxicating##
 
-![tatoo](/y-combinator.jpg)
+![tatoo](/y-combinator-fixed.jpg)
 
 There's a tendency for people to say "Y-combinator" to refer to fixed-point combinators generally. We'll probably fall into that usage ourselves. Speaking correctly, though, the Y-combinator is only one of many fixed-point combinators.
 

diff --git a/y-combinator-fixed.jpg b/y-combinator-fixed.jpg
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Binary files /dev/null and b/y-combinator-fixed.jpg differ