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The left diagram is a cross section through the leaning tower. You can see the horizontal trusses and the concrete infill.
The hole in the middle contains the staircase. The two small elliptical holes on the left are where the cables pass through. They are anchored behind the far side of the tower.

The right hand diagram (not drawn to scale) is a sketch to illustrate the connection between outer steel plate and the trusses.

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