It's a local agreement between the plants of local 900. If you are on indefinate layoff from one of the plants, you can bump a person in another plant. If you have more than 6, you bump someone with less than 6. If you have more than 10, you bump someone with less than 10. If you have more than 15, you bump someone with less than 15. So basically, if you have 15 years in, you can't be bumped. Someone correct me if I'm wrong.