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After seeing #1231 I looked at how this was implemented, and it made no sense to me. Hide any auto-generated furnace/alloy smelter/macerator recipe that didn't involve iron, and any arc furnace recipe unless it involved iron, wrought iron, copper, or annealed copper (which leaves a lot of machines still listed when looking up how to make annealed copper)? That's the wrong approach IMO. I've taken bear989's suggestion and hidden recipes for recycling machines, as well as special metaitems like motors and conveyor modules.