Download: Minecraft PE (v0.14.3) - How To Duplicate Diamond/Gold/Iron for iPhone/iPod/iPad/Android
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I know I uploaded this video more than three years ago, BUT it works for VERSION 0.14.3! You need at LEAST TWO DEVICES to do the glitch, doesn't matter if they are the same or different, and if you have more than two devices you will duplicate items even faster!