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>but the fact that the regulation is not actually clear

I see this "not clear" repeated here. Can you cite a section that you find not clear, so we understand what you mean?

Can you cite the definition of "large scale", please?

"involving large numbers or a large area; extensive."

When does n grains of sand become a sand pile?

I'd say if you put it on a indoor table, a measly cubic centimetre of sand can make a (small) pile, and a random estimate on the internet states that there are 8000 grains of sand in a cubic centimetre.

So n = 8000 makes a sand pile.

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