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Not to detract from the skill required, but I believe that the two balls surrounding the gap aren't far enough apart to allow the ball to go through (At the start, the ball is noticeably inside the circle), and the balls they touch work like a stone arch to distribute the force when the ball comes in and fills the gap like a keystone.
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|...............| We live in the nick of times.
| Len 17, Wid 3 |
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