A Trading Nitwit - Minecraft Command

/summon Villager ~1 ~ ~ {
    Profession: 5,
    CustomName: "Frank",
    CustomNameVisible: 1,
    Career: 1,
    CareerLevel: 42,
    CanPickUpLoot: 0,
    PersistenceRequired: 1,
    Invulnerable: 1,
    Offers: {
        Recipes: [
            {
                buy: {
                    id: "dirt",
                    Count: 1
                },
                maxUses: 9999999,
                sell: {
                    id: "diamond",
                    Count: 64
                },
                rewardExp: false
            },
            {
                buy: {
                    id: "barrier",
                    Count: 1
                },
                maxUses: 9999999,
                sell: {
                    id: "barrier",
                    Count: 1
                },
                rewardExp: false
            }
        ]
    }
}