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I was confused at first as well. It means a circle with its center one of the original two points you are given.

At least I thought so... shouldn't this be circle pack 7 in origin circle?

http://sciencevsmagic.net/geo/#0A1.1A0.2A3.4A0.6A1.14A4.5A1....

Not detected as such.

It actually must be a circle with its centre one of the original two points AND the other point on it's edge (so it's one of the two possible first circles you can draw). Sorry that that wasn't clear enough.

Thanks for the update! I've replaced one confusion with another... b^)

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