Villagers Avoid Trading Items Other Villagers Trade

Villagers in a certain amount of blocks (around the size of a large village), would now try to avoid trading the same unique trades.

For example, If a librarian already trades a knockback enchantment book, other librarians would not trade this item unless all other unique librarian trades are used as well.

This system would allow users to gain all available trades for villagers' professions within a certain amount, while also making sure that players can always find unique trades in a village.