Seven: A, B, D, O, P, Q, R
A closed space is similar to a closed shape. A circle, square, triangle are closed shapes, they do not have any openings. If you were to put something inside of them, it could not get out. A closed space in a letter is similar in that the space that is closed would not allow anything to get out. An example of a letter with an open space would be E. The side is open. However, a letter like B has both sides closed.