Two men swimming on a lake.
Two men fishing on the lake.
The men can either be swimming or fishing, not both.
exists e1 x1 x2 x3.(a_topic(x1) & on(e1,x3) & n_lake(x3) & Actor(e1,x2) & v_swim(e1) & (x1 = x2) & n_man(x1) & card_eq_2(x1))
exists x1 x2 x3.(n_lake(x3) & a_topic(x1) & on(x1,x3) & n_fishing(x1) & of(x1,x2) & n_man(x2) & card_eq_2(x1))