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-rw-r--r--src/main/java/design/model/undo/Memento.java4
1 files changed, 4 insertions, 0 deletions
diff --git a/src/main/java/design/model/undo/Memento.java b/src/main/java/design/model/undo/Memento.java
new file mode 100644
index 0000000..162c3f3
--- /dev/null
+++ b/src/main/java/design/model/undo/Memento.java
@@ -0,0 +1,4 @@
+package design.model.undo;
+
+public interface Memento {
+}