jianminchen
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+Sept. 9, 2018
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 Here is the problem statement. 
 
 Design classes for the binary expression tree with addition, multiplication operations. Try to apply S.O.L.I.D. principles, single responsibilit principle, open for extension and close for change principle, Open/ close principle.
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`3`	`5`	`Design classes for the binary expression tree with addition, multiplication operations. Try to apply S.O.L.I.D. principles, single responsibilit principle, open for extension and close for change principle, Open/ close principle.`