two men climb a large rock.
Three people slide down a rock.
One cannot be both climbing a large rock and sliding down a rock at the same time.
exists e1 s1 x1 x2.(Theme(e1,x2) & Actor(e1,x1) & v_climb(e1) & n_rock(x2) & a_large(s1) & Theme(s1,x2) & n_man(x1) & card_eq_2(x1))
exists e1 s1 x1 x2.(n_rock(x2) & Time(e1,x2) & a_down(s1) & Manner(e1,s1) & Actor(e1,x1) & v_slide(e1) & n_people(x1) & card_eq_3(x1))