diff --git a/refactoring/src/main/java/com/example/refactoring/_13_loops/_33_replace_loop_with_pipeline/Author.java b/refactoring/src/main/java/com/example/refactoring/_13_loops/_33_replace_loop_with_pipeline/Author.java
index a0c54335..0f51600b 100644
--- a/refactoring/src/main/java/com/example/refactoring/_13_loops/_33_replace_loop_with_pipeline/Author.java
+++ b/refactoring/src/main/java/com/example/refactoring/_13_loops/_33_replace_loop_with_pipeline/Author.java
@@ -1,6 +1,5 @@
 package com.example.refactoring._13_loops._33_replace_loop_with_pipeline;
 
-import java.util.ArrayList;
 import java.util.List;
 import java.util.Objects;
 
diff --git a/refactoring/src/main/java/com/example/refactoring/_14_lazy_element/_34_collapse_hierarchy/Reservation.java b/refactoring/src/main/java/com/example/refactoring/_14_lazy_element/_34_collapse_hierarchy/Reservation.java
new file mode 100644
index 00000000..e492ae65
--- /dev/null
+++ b/refactoring/src/main/java/com/example/refactoring/_14_lazy_element/_34_collapse_hierarchy/Reservation.java
@@ -0,0 +1,19 @@
+package com.example.refactoring._14_lazy_element._34_collapse_hierarchy;
+
+import java.time.LocalDateTime;
+import java.util.List;
+
+public class Reservation {
+
+    private LocalDateTime startDateTime;
+
+    private LocalDateTime endDateTime;
+
+    private List<String> members;
+
+    private String owner;
+
+    private boolean paid;
+
+    private String courtNumber;
+}
diff --git a/refactoring/src/main/java/com/example/refactoring/_14_lazy_element/_34_collapse_hierarchy/_before/CourtReservation.java b/refactoring/src/main/java/com/example/refactoring/_14_lazy_element/_34_collapse_hierarchy/_before/CourtReservation.java
new file mode 100644
index 00000000..3a96dd76
--- /dev/null
+++ b/refactoring/src/main/java/com/example/refactoring/_14_lazy_element/_34_collapse_hierarchy/_before/CourtReservation.java
@@ -0,0 +1,7 @@
+package com.example.refactoring._14_lazy_element._34_collapse_hierarchy._before;
+
+public class CourtReservation extends Reservation {
+
+    private String courtNumber;
+
+}
diff --git a/refactoring/src/main/java/com/example/refactoring/_14_lazy_element/_34_collapse_hierarchy/_before/Reservation.java b/refactoring/src/main/java/com/example/refactoring/_14_lazy_element/_34_collapse_hierarchy/_before/Reservation.java
new file mode 100644
index 00000000..175bc3db
--- /dev/null
+++ b/refactoring/src/main/java/com/example/refactoring/_14_lazy_element/_34_collapse_hierarchy/_before/Reservation.java
@@ -0,0 +1,18 @@
+package com.example.refactoring._14_lazy_element._34_collapse_hierarchy._before;
+
+import java.time.LocalDateTime;
+import java.util.List;
+
+public class Reservation {
+
+    private LocalDateTime startDateTime;
+
+    private LocalDateTime endDateTime;
+
+    private List<String> members;
+
+    private String owner;
+
+    private boolean paid;
+
+}