2 worthy mentions that you can start out with 11 items to start and 1 duplication design not.

The third version is the most effective way to duplicate.

In the duplication glitch, the bare minimum items to start with, is 11 items, such as diamond, ingot's, nugget's and, hey.

This is the video I said I would link in the description Watch "Guaranteed way to duplicate iron without making iron doors Minecraft Xbox One" on YouTube

not.