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var pinv=player.getInventory();
boox = 340;

    var bkSlot = player.getInventory().getSlotContainingItem(boox);
        if (bkSlot != -1)
        {
                var buuk = player.getInventory().getItemInSlot(bkSlot);
                buuk.quantity = 0;
        }
        function bookRegen()
{
var mainItem = pinv.getCurrentItem();
var offItem = pinv.getOffhandItem();

if ((mainItem != null && mainItem.getItemID() == 340) || (offItem != null && offItem.getItemID() == 340))
{
var bkSlot = pinv.getSlotContainingItem(340);

if (bkSlot != -1)
{
var buuk = pinv.getItemInSlot(bkSlot);
if (buuk.damage < 10)
{
regenDelay -= 1;
if (regenDelay <= 0)
{
regenDelay = 20;
buuk.damage += 1;
}
}
}
}
else
{
regenDelay = REGEN_DELAY;
}
}

        var booknum = buuk.getDamage();

if (hitBlock != null && world.getBlockID(hitBlock.x, hitBlock.y, hitBlock.z) == 47) {

if (booknum <= 0)
{
        booknum = 0;
        buuk.setDamage(+1);


}
}