From f70130322cd306268c5da12c1517dc5725615ae8 Mon Sep 17 00:00:00 2001
From: Louis Pilfold <louis@lpil.uk>
Date: Thu, 15 Feb 2024 12:18:17 +0000
Subject: text -> en

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+<p>
+  The <code>fn</code> keyword is used to define new functions.
+</p>
+<p>
+  The <code>double</code> and <code>multiply</code> functions are defined
+  without the <code>pub</code> keyword. This makes them <em>private</em>
+  functions, they can only be used within this module. If another module
+  attempted to use them it would result in a compiler error.
+</p>
+<p>
+  Like with assignments, type annotations are optional for function arguments
+  and return values. It is considered good practice to use type annotations for
+  functions, for clarity and to encourage intentional and thoughtful design.
+</p>
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