Today I present to you a trade machine! It allows a player to stand on each side, present items, and trade them without the risk of scamming! It uses NO command blocks so it's completley survival friendly!

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HOW TO USE:
1. Place items in the water on the right side
2. Look through the window to see what items the other player offered
3. Press the lever (then wait for the other player to do the same) to accept the trade offer
4. Collect your items from the chest on the left

Items will only go through if both players hit the lever! Plus, you can easily take back your items at any time during the trade.

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(The zip file contains both a world file and an MCEdit schematic)