Two people walk outside in a nature area.
Two people are standing beside a lake, skipping stones.
Two people cannot be walking and standing at the same time.
exists e1 x1 x2 x3 x4.(a_topic(x1) & in(e1,x4) & n_nature(x4) & outside(e1,x3) & n_area(x3) & Theme(e1,x2) & v_walk(e1) & (x1 = x2) & n_people(x1) & card_eq_2(x1))
exists e1 e2 x1 x2 x3.(for(e1,e2) & Theme(e2,x3) & Actor(e2,x1) & v_skip(e2) & n_stone(x3) & beside(e1,x2) & n_lake(x2) & Actor(e1,x1) & v_stand(e1) & n_people(x1) & card_eq_2(x1))