Start "input-output" lesson

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+    <article class="lesson" data-lesson="inputOutput">
+
+        <header class="lessonHeader">
+            <p class="lessonNumber">Lesson 3</p>
+
+            <h1>Input & Output</h1>
+
+            <p class="lessonDescription">
+                Learn how to get information from the user
+                and display results with Python.
+            </p>
+        </header>
+
+        <section class="lessonSection">
+            <h2>What is input and output?</h2>
+
+            <p>
+                Programs often need to communicate with the user.
+                They can receive information from the user and
+                display information back to them.
+            </p>
+
+            <p>
+                <strong>Input</strong> is information that a program
+                receives from the user.
+            </p>
+
+            <p>
+                <strong>Output</strong> is information that a program
+                displays to the user.
+            </p>
+
+            <p>
+                In Python, we can use <code>input()</code> to get
+                information from the user and <code>print()</code>
+                to display information.
+            </p>
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