diff --git a/slides.md b/slides.md
index 536479e..fdfcbb8 100644
--- a/slides.md
+++ b/slides.md
@@ -710,20 +710,18 @@
 # ADTs: Json
 
 ```java
-sealed interface Json {
-    static void main() {
-        var json = array(
-            object(
-                entry("name", string("Toni")),
-                entry("age", number(46)),
-                entry("old", JsonBoolean.TRUE)),
-            object(
-                entry("name", string("Baby")),
-                entry("age", JsonNull.NULL),
-                entry("old", JsonBoolean.FALSE))
-        );
-        System.out.println(json.asString());
-    }
+static void main() {
+    var json = array(
+        object(
+            entry("name", string("Toni")),
+            entry("age", number(46)),
+            entry("old", JsonBoolean.TRUE)),
+        object(
+            entry("name", string("Baby")),
+            entry("age", JsonNull.NULL),
+            entry("old", JsonBoolean.FALSE))
+    );
+    System.out.println(json.asString());
 }
 ```
 
@@ -795,7 +793,6 @@
       case EmptyCast() -> "cast cannot be empty";
       case DuplicatedActor(var actor) -> "duplicated actor: " + actor;
     };
-
     return ProblemDetail.forStatusAndDetail(BAD_REQUEST, detail);
 }
 ```
@@ -926,7 +923,7 @@
 
 ---
 
-# ¿Preguntas? :question:
+# ¿Preguntas?
 
 <!-- _class: lead -->