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local function get_module_names(name)          --name = "assembling-machine-3"
	local names = {}
	local cs = prototypes.entity[name].allowed_module_categories
	local items = prototypes.get_item_filtered({{filter = "type", type = "module"}})
	for im,item in pairs(items) do 
		local c = item.category
		if cs[c]
		then table.insert(names,im)
		end
	end
	return names
end