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--- a/06_js-debug/uebungen/u02_extraction/index.html
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+<!DOCTYPE html>
+<html lang="en">
+  <head>
+    <meta charset="UTF-8" />
+    <meta name="viewport" content="width=device-width, initial-scale=1.0" />
+    <title>Exercise: Nested If-Statements</title>
+  </head>
+  <body>
+    <h1>Exercise: Nested If-Statements</h1>
+
+    <script>
+      'use strict';
+
+      const isLibraryUpdating = false;
+      const isUserLoggedIn = true;
+      const hasLibrarianPermissions = true;
+      const hasBookEditCapability = false;
+      const hasBookAccess = false;
+
+      const bookCollection = [
+        {
+          title: 'Book A',
+          price: 150,
+          quantity: 5,
+        },
+        {
+          title: 'Book B',
+          price: 250,
+          quantity: 0,
+        },
+        {
+          title: 'Book C',
+          price: 350,
+          quantity: 10,
+        },
+      ];
+
+      function handleLibraryOperations() {
+        if (!isLibraryUpdating) {
+          if (isUserLoggedIn) {
+            if (hasLibrarianPermissions || (hasBookEditCapability && hasBookAccess)) {
+              bookCollection.forEach((book) => {
+                console.log(`Book Title: ${book.title}`);
+                if (book.price > 200) {
+                  console.log('Book price is greater than 200.');
+                } else {
+                  console.log('Book price is less than or equal to 200.');
+                }
+                if (book.quantity > 0) {
+                  console.log('Book is available.');
+                } else {
+                  console.log('Book is unavailable.');
+                }
+                console.log('---');
+              });
+            } else {
+              console.log('Insufficient rights to manage books.');
+            }
+          } else {
+            console.log('Please log in to manage books.');
+          }
+        } else {
+          console.log('Library system is currently updating.');
+        }
+      }
+
+      handleLibraryOperations();
+    </script>
+  </body>
+</html>