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MicroElf, why bother when Nodl has already provided a graphical solution for this task? You create a complete image from as many screenshots as you want and then overlay Nodl's drawn grid on it.
(You can thank him for the grid :) )
I understand that patience and hard work will eventually lead to success, but I think it's better to practice and develop the ability to feel and solve such problems on the fly. But of course, this is just my opinion.