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template <typename T> class container {
public:
virtual container() = 0;
virtual ~container() = 0;
virtual void resize(int resize) = 0;
virtual void clear() = 0;
virtual void insert(T element, int pos) = 0;
virtual T at(int pos) = 0;
virtual void erase(int pos) = 0;
virtual void emplace(T element, int pos) = 0;
virtual void push_first(T element) = 0;
virtual void push_back(T element) = 0;
virtual void pop_first() = 0;
virtual void pop_back() = 0;
};
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