- bag-union! bag1 bag2 ...procedure
- bag-intersection! bag1 bag2 ...procedure
- bag-difference! bag1 bag2 ...procedure
- bag-xor! bag1 bag2procedure
Linear update procedures returning a bag that is the union, intersection, asymmetric difference, or symmetric difference of the bags. Asymmetric difference is extended to more than two bags by taking the difference between the first bag and the union of the others. Symmetric difference is not extended beyond two bags.