Minecraft looting enchantment?

I have a question about the looting enchantment. Namely, I would like to plunder on a strong 4 sword. Now my question is: What enchantments can I no longer put on it when it is plundered?

You can make an anvil and then put 2 swords on it, or 1 sword and 1 enchanted book. Then you can look over at the sword to see which enchantments come into the sword and which don't.