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3The angles thus pointing to staircases will be seven in number, the remaining five will mark certain points on the scene. That in the middle, for instance, will mark the situation of the royal doors, those on the right and left, the doors of guests, and those at the extremities, the points at which the road turns off. The seats (gradus) on which the spectators sit are not to be less than twenty inches in height, nor more than twenty-two. Their width must not be more than two feet and a half, nor less than two feet.
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