Trying to understand Minecraft Redstone I don't understand

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In this Mumbo Jumbo Minecraft video, I'm trying to understand minecraft redstone that I don't understand. I'm learning Minecraft redstone, and taking you through how redstone works step by step. This machine relies on redstone logic, Minecraft programming and some very basic Minecraft computing to work. This a redstone thing that only old school Minecrafters will remember, as back in Minecraft Beta these were incredibly popular Minecraft security devices!

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where do i hide my minecraft diamonds?