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Can you make a small simple program that compiles, executes and shows the problem.

There needs to be one place the board is created with methods for all users to get to it to make updates etc.

Then the Human class has a board and the Computer class has a board, making two boards.

What did that mean if there is only one board in the Game class? Is there more than one instance of the Game class?

If there is supposed to be a single board, what class would it be in? How would each player get access to the single board?