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function blacklist_item_from_spawns(id)
local all_groups = game.get_item_groups()
for _, group_id in ipairs(all_groups) do
-- a chance of 0 removes the item
game.add_item_to_group(group_id, id, 0)
end
end
blacklist_item_from_spawns("jam_strawberries")
blacklist_item_from_spawns("jam_blueberries")
-- also remove rocks from spawn, since it's rather hard to test whether
-- jams spawn or not ;) rock recipes should still exist though, leading
-- to hilarity
blacklist_item_from_spawns("rock")
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