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<!DOCTYPE html> <html> <body> <h2>JavaScript Sets</h2> <p>Add values to a Set:</p> <p id="demo"></p> <script> // Create a Set const letters = new Set(); // Add Values to the Set letters.add("a"); letters.add("b"); letters.add("c"); // Display set.size document.getElementById("demo").innerHTML = letters.size; </script> </body> </html>