Two people on a surfboard in the water
Two people are climbing a mountain.
The two people are either on a surfboard or climbing a mountain, both which they can't do simultaneously.
exists x1 x2 x3.(n_water(x3) & a_topic(x1) & on(x1,x2) & in(x2,x3) & n_surfboard(x2) & n_people(x1) & card_eq_2(x1))
exists e1 x1 x2.(Theme(e1,x2) & Actor(e1,x1) & v_climb(e1) & n_mountain(x2) & n_people(x1) & card_eq_2(x1))