From ab2b9a982ede817362072623ff9ae2aa42e083da Mon Sep 17 00:00:00 2001
From: Louis Pilfold <louis@lpil.uk>
Date: Thu, 18 Jan 2024 20:34:43 +0000
Subject: Move recursion lessons together

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 src/content/chapter2_flow_control/lesson11_guards/text.html | 9 +++++++++
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+<p>
+  The <code>if</code> keyword can be used with case expressions to add a
+  <em>guard</em> to a pattern. A guard is an expression that must evaluate to
+  <code>True</code> for the pattern to match.
+</p>
+<p>
+  Only a limited set of operators can be used in guards, and functions cannot be
+  called at all.
+</p>
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