Two children bury a third in the sand.
The children are playing in the sand.
If the children bury a child in sand, they are playing.
exists e1 x1 x2 x3.(n_sand(x3) & in(e1,x3) & Theme(e1,x2) & Actor(e1,x1) & v_bury(e1) & n_third(x2) & n_child(x1) & card_eq_2(x1))
exists e1 x1 x2.(n_sand(x2) & n_child(x1) & in(e1,x2) & Actor(e1,x1) & v_play(e1))