diff --git a/Prog/Collections.md b/Prog/Collections.md
index c85a6c6..0a8949b 100644
--- a/Prog/Collections.md
+++ b/Prog/Collections.md
@@ -54,7 +54,17 @@ public static class Program {
 namespace Lecture;
 public static class Program {
 	public static void Main() {
-		var dict = Dictionary<
+		var dict = Dictionary<int, string>();
+		dict.Add(3, "tree");
+		dict.Add(9, "nine");
+		dict[9] = "nine";
+		dict[4] = "four";
+		dict.Add(4, "quatre"); // Raise an exception because key 4 exists
+		Console.WriteLine($"{dict[4]}"); // Return four
+		foreach (var kv in dict) {
+			Console.WriteLine($"dict[{kv.Key}] == {key.value}");
+		}
+	
 	}
 
 }