3 (declare-fun s () (Set E))
4 (declare-fun t () (Set E))
5 (declare-fun u () (Set E))
6 (assert (>= (card (union s t)) 8))
7 (assert (>= (card (union s u)) 8))
8 ;(assert (<= (card (union t u)) 5))
9 (assert (<= (card s) 5))
10 (assert (= (as emptyset (Set E)) (intersection t u)))
17 (assert (member x1 s))
18 (assert (member x2 s))
19 (assert (member x3 s))
20 (assert (member x4 s))
21 (assert (member x5 s))
22 (assert (member x6 s))