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I can't thing of any auto action you could do. The only thing I can image is to use the pen or polygonal lasso. If you use the pen, you can make all the selections one by one, all without changing the path, just adding to it. You can just add to lasso selections using the shift/add tool or setting the plus function on the tool. That is what I would try. No matter what you do, I think it will be time consuming.