add toc

diff --git a/exercises/assignment7.mdwn b/exercises/assignment7.mdwn
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@@ -1,8 +1,8 @@
-# Assignment 7
-
 There is no separate assignment 6. (There was a single big assignment for weeks 5 and 6, and
 we're going to keep the assignment numbers in synch with the weeks.)
 
+[[!toc]]
+
 ## Evaluation order in Combinatory Logic
 
 1. Give a term that the lazy evaluators (either [[the Haskell