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#include <iostream>
class Matrix {
int values[4];
void addBy(int amount);
public:
Matrix(int a, int b, int c, int d);
Matrix& operator++();
Matrix operator++(int);
Matrix& operator--();
Matrix operator--(int);
Matrix& operator+=(const Matrix& rhs);
Matrix& operator-=(const Matrix& rhs);
Matrix& operator*=(const Matrix& rhs);
friend Matrix operator+(const Matrix& lhs, const Matrix& rhs);
friend Matrix operator-(const Matrix& lhs, const Matrix& rhs);
friend Matrix operator*(const Matrix& lhs, const Matrix& rhs);
friend std::ostream& operator<<(std::ostream& lhs, const Matrix& rhs);
friend std::istream& operator>>(std::istream& lhs, Matrix& rhs);
};
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