diff --git a/doc/sandbox.mdwn b/doc/sandbox.mdwn
index d388342da..35edc1ff7 100644
--- a/doc/sandbox.mdwn
+++ b/doc/sandbox.mdwn
@@ -9,6 +9,7 @@ Testing.
 [[!sidebar ]]
 
 Here's a hr:
+
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 ## number 2