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The tips mentioned in the other guides are very helpful, but in addition I noticed one other thing that helps a lot: Meat duplication. When the 2nd phase comes around, give one meat to the person on the right, have them cut it then drop it onto the conveyor. Wait for it to stop at the end, then press A on it with a pan. This will put a patty in the pan while leaving the meat on the belt, essentially creating a box of patties.