```ruby
require "tic_tac_toe/version"

module TicTacToe
  # Your code goes here...
  class Board
    def pos coords

    end
  end
end
```

Return blank strings from pos
user
```ruby
require "tic_tac_toe/version"

module TicTacToe
  # Your code goes here...
  class Board
    def pos coords
      " "
    end
  end
end
```
assistant