Updates kapitel-3.md

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book.json

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+{
+    "plugins": ["exercises"]
+}

kapitel-3.md

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 # Kapitel 3: Übertragungsprotokolle und Datentransformationen \(02.11.2017\)
 
+{% exercise %}
+Define a variable `x` equal to 10.
 
+{% initial %}
+var x =
+
+{% solution %}
+var x = 10;
+
+{% validation %}
+assert(x == 10);
+
+{% context %}
+// This is context code available everywhere
+// The user will be able to evaluate `exposedVar`
+var exposedVar = 3;
+// ... or call `exposedFunction`
+function exposedFunction {
+    return 3;
+}
+{% endexercise %}