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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>