UML-diagram.md

-![UML_diagram__5_.svg](uploads/4f1e384ab2459dfc709790d2b0b28b9a/UML_diagram__5_.svg)
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+![UML_diagram__6_.svg](uploads/af9d2f030d0edc43bcf1b67edfa17f54/UML_diagram__6_.svg)
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