diff --git a/lecture/src/lecture2_4.java b/lecture/src/lecture2_4.java
index bcd6425..ecb90ca 100644
--- a/lecture/src/lecture2_4.java
+++ b/lecture/src/lecture2_4.java
@@ -25,7 +25,7 @@ public static void main(String[] args) {
         w[0][0] = -w[0][0];
         System.out.println(Arrays.toString(w[0]));
 
-        
+
     }
 }
 
diff --git a/out/production/lecture/IntList.class b/out/production/lecture/IntList.class
deleted file mode 100644
index fcc71ef..0000000
Binary files a/out/production/lecture/IntList.class and /dev/null differ
diff --git a/out/production/lecture/SList$IntNode.class b/out/production/lecture/SList$IntNode.class
deleted file mode 100644
index 95e4ae2..0000000
Binary files a/out/production/lecture/SList$IntNode.class and /dev/null differ
diff --git a/out/production/lecture/SList.class b/out/production/lecture/SList.class
deleted file mode 100644
index 19b8051..0000000
Binary files a/out/production/lecture/SList.class and /dev/null differ
diff --git a/out/production/lecture/lecture2_1.class b/out/production/lecture/lecture2_1.class
deleted file mode 100644
index 8cb8b1c..0000000
Binary files a/out/production/lecture/lecture2_1.class and /dev/null differ
diff --git a/out/production/lecture/lecture2_2.class b/out/production/lecture/lecture2_2.class
deleted file mode 100644
index dc2977a..0000000
Binary files a/out/production/lecture/lecture2_2.class and /dev/null differ
diff --git a/out/production/lecture/lecture2_4.class b/out/production/lecture/lecture2_4.class
deleted file mode 100644
index 9116f8c..0000000
Binary files a/out/production/lecture/lecture2_4.class and /dev/null differ