Apologies if this is ridiculous and should be in no stupid questions but it just struck me
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Firstly the eggs are sorted by weight/size. Even on normal boxes you see the markings M, L or XL referring to the size of eggs. Double yolk eggs are usually much larger then other eggs. In addition to this the eggs are photographed with a strong light behind them which allow you to see some of the structures in the egg. You can therefore see things like double yolks in these photos and sort out these eggs.
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