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	tab= {}
			
	for _, ent in pairs(surface.find_entities_filtered{area=a, type="assembling-machine"}) do
		tab[ent] = {m=1, n=2 } -- i create a table indexed by entities
	end

	for _, ent in pairs(surface.find_entities_filtered{area=a, type="assembling-machine"}) do -- then I try to access this table I created before
		local ref = tab[ent] 
				-- here, ref contains nil : it does not point to the object I created in the previous loop!
	end