Four children are playing by an outdoor fountain.
Four children are playing outside.
For children to be playing by an outdoor fountain they must be outside. Therefore the children are outside.
exists e1 s1 x1 x2.(by(e1,x2) & n_fountain(x2) & a_outdoor(s1) & Theme(s1,x2) & Actor(e1,x1) & v_play(e1) & n_child(x1) & card_eq_4(x1))
exists e1 x1 x2.(Theme(e1,x2) & Actor(e1,x1) & v_play(e1) & n_outside(x2) & n_child(x1) & card_eq_4(x1))