Performed laboratory works in OOP (C#.NET) Variant 2

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In the archive you will find completed laboratory work from 1 to 4 inclusive (2nd variant).
The archive contains 4 MS Visual Studio projects of completed laboratory work (2nd varinat) from the tutorial:

MOSCOW STATE UNIVERSITY
named after M. V. LOMONOSOV
Faculty of computational mathematics and Cybernetics

N. I. Berezina
Laboratory works on a course
Object-oriented programming:
the C#programming language

See a screenshot:
http://prntscr.com/9uzxcg

Download the task:
https://cloud.mail.ru/public/7KdY/4hDudJETU
The Tasks inside