Some Enchantments appear more frequently than others in the Enchanting Table

Steps to Reproduce

1. In Creative Mode Or Survival place an Enchanting Table on the Ground and Leave the Enchanting Table at level 30
2. See the Enchantments. Most often the same enchantments appear one after another
3.Get any sword. The Enchantments that appear with Frequency are Bane of Arthropods, Looting, Unbreaking, Smite And Fire Aspect