Ment
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43.
They all have the same thickness, and there are so many lines... But knowing where to look, you can examine them more closely and see them.
The question is, if I didn't know, I think I would have found 4 fewer.
Also, due to the characteristics of my screen, some lines seem to be made up of pixels of different colors (especially noticeable on blue-green).
Ah, never mind, there are 39 of them. Phew.