Perfect Testificate

A Perfect Testificate is a Testificate who offers all trades for their profession, and as their final trade buys a renewable and ideally easy to obtain resource. This setup allows players to use all their trades infinitely, without having to worry about trades getting locked.

The Trading Hell is currently trying to create a perfect Librarian and a perfect Blacksmith.

Setup
Follow these steps to get a perfect testificate:


 * 1) Get a testificate of the desired profession, who does not have the desired final trade as their first trade.
 * 2) Use their last trade once.
 * 3) Exit the trading GUI.
 * 4) Wait until both the green and purple particle effects appear.
 * 5) Check the last trade. If it is not the desired last trade, go back to step 2.
 * 6) Count the number of trades. If it is equal to the maximum number of trades listed on this article (the number of “Buys” and “Sells” combined, plus a single “Enchants” trade for Priests), the testificate is now perfect. If they do not have all trades, they cannot become perfect anymore: you have to start over with another testificate.

Usage
Once you have a perfect testificate, here is how to trade with them:


 * If you want to use a trade, but it is locked, go to the last trade and use it once, then exit the trading GUI and wait for the particle effects to appear. This causes the testificate to unlock all trades, including the last one.
 * After exiting the trading GUI, do not log out, die, throw an Ender pearl, or use a Nether portal for at least 15 seconds (longer in case of lag).
 * If the last trade is locked, exit the trading GUI for 15 seconds (longer in case of lag). If it is still locked, someone ignored the above and the testificate is now useless.