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diff --git a/exercises/_assignment6.mdwn b/exercises/_assignment6.mdwn
index 91566c9d..cd9db086 100644
--- a/exercises/_assignment6.mdwn
+++ b/exercises/_assignment6.mdwn
@@ -174,15 +174,15 @@ is `\p.[p]`, and the composition operator is
 
 Sanity check: 
 
-     f p = [x, x+1]
-     s q = [x*x, x+x]
+     f p = [p, p+1]
+     s q = [q*q, q+q]
      >=> f s 7 = [49, 14, 64, 16]
 
 3. Do the same for zippy lists.  That is, you need to find a
 composition operator such that
 
-     f p = [x, x+1]
-     s q = [x*x, x+x]
-     >=> f s 7 = [49, 64]
+      f p = [p, p+1]
+      s q = [q*q, q+q]
+      >=> f s 7 = [49, 64]
 
 and then prove it obeys the monad laws.