Two people sit on sand with many buildings behind them.
Two people are swimming.
The two people cannot be doing both sitting on sand as well as swimming.
exists e1 x1 x2 x3.(behind(e1,x1) & n_thing(x1) & with(e1,x3) & n_building(x3) & n_quantity(x3) & on(e1,x2) & n_sand(x2) & Actor(e1,x1) & v_sit(e1) & n_people(x1) & card_eq_2(x1))
exists e1 x1.(Actor(e1,x1) & v_swim(e1) & n_people(x1) & card_eq_2(x1))