There are two small children playing in a yard.
Two small children sit in a stadium.
The children cannot sit and play simultaneously, and cannot be in a stadium and a yard at the same time
exists p1 x1 e1 s1 x2 x3 x4.((x1 = x2) & in(e1,x4) & n_yard(x4) & Actor(e1,x3) & v_play(e1) & (x2 = x3) & n_child(x2) & a_small(s1) & Theme(s1,x2) & card_eq_2(x2))
exists e1 s1 x1 x2.(in(e1,x2) & n_stadium(x2) & Actor(e1,x1) & v_sit(e1) & n_child(x1) & a_small(s1) & Theme(s1,x1) & card_eq_2(x1))