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Spot Thirteen

Stage: 2 Challenge Level: Challenge Level:1

Have you watched the way the score changes as you add more and more spots?  This might give you a clue as to what is going on.

Trying to make a very low score might help.

Here is a picture showing the first $9$ spots I tried (in blue):

What do you think the score is so far?  Check using the interactivity.  How does this help?