I learned how to copy items in SSM without a mod!

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First, open your game and go in a nice open place where you'll have enough room. Second, throw everything you would like to copy on the ground, save and go to title menu. Third, Log back into game pick up items and press alt and F4 simultaneously (DO NOT OPEN INVENTORY OR PRESS ESC!) This will bring you back to your desktop. Re-login enter the game and you should have a copy of everything you had thrown on the floor! I hope this helped!