UML-diagram.md

-![UML_diagram__4_.svg](uploads/aa00c8b0d2b2b28d30d4e8d719adb6a2/UML_diagram__4_.svg)
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+![UML_diagram__5_.svg](uploads/4f1e384ab2459dfc709790d2b0b28b9a/UML_diagram__5_.svg)
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