diff --git a/class_diagram/dang_Ky_Ca_ClassDiagram.drawio b/class_diagram/dang_Ky_Ca_ClassDiagram.drawio
new file mode 100644
index 0000000..4fdc595
--- /dev/null
+++ b/class_diagram/dang_Ky_Ca_ClassDiagram.drawio
@@ -0,0 +1,169 @@
+<mxfile host="app.diagrams.net">
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