This is a problem that builds upon these two problems: within a sphere and with two planes .
This problem's question: What is the most specific correct answer to what is the path through the centers of the maximum number of added spheres in the other two problems?
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See Wikipedia article: Soddy's Hexlet : "... the centers of the hexlet spheres lie in a single plane, on an ellipse." Circles are a special case of ellipses.