{
	"criteria":
	{
		"recipe_unlocked":
		{
			"trigger": "minecraft:recipe_unlocked",
			"conditions":
			{
				"recipe": "anvil"
			}
		}
	},
	"rewards":
	{
		"commands":
		[
			"/advancement revoke @s only custom:recipe_test",
			"/recipe take @s minecraft:anvil",
            "/scoreboard players tag @s[tag=hasKnowledgeBook] remove hasKnowledgeBook",
            "/scoreboard players tag @s add hasKnowledgeBook {Inventory:[{id:\"minecraft:knowledge_book\"}]}",
            "/say @s[tag=hasKnowledgeBook] currently has a knowledge book"
		]
	}
}