Documentation:OCLOperators intersection

intersection ( bag : Bag(T) ) : Bag(T)

Returns a Bag containing all elements of self that are also contained by *bag*.

Expression	Result
Bag{'a', 'b', 'a'}->intersection(Bag{'a', 'b'})	Bag{'a', 'b'}
Bag{'a', 'b', 'a', 'b'}->intersection(Bag{'a', 'b', 'b'})	Bag{'b', 'a', 'b'}
Set{1,2,3}->intersection(Set{2,3,4})	Set{2,3}

See: Examples_on_collection_operators