A child hidden by balls
A child hidden by snow.
Balls and snow are two different things.
exists e1 x1 x2.(Actor(e1,x2) & n_ball(x2) & Theme(e1,x1) & v_hide(e1) & n_child(x1))
exists e1 x1 x2.(Actor(e1,x2) & n_snow(x2) & Theme(e1,x1) & v_hide(e1) & n_child(x1))