Four children are playing on a hill of sand.
Four siblings are building sand castles at the beach.
Just because the children are playing on a hill of sand doesn't mean they are building sand castles at the beach.
exists e1 x1 x2 x3.(on(e1,x2) & of(x2,x3) & n_sand(x3) & n_hill(x2) & Actor(e1,x1) & v_play(e1) & n_child(x1) & card_eq_4(x1))
exists e1 x1 x2 x3 x4.(n_beach(x4) & at(e1,x4) & Theme(e1,x2) & Actor(e1,x1) & v_build(e1) & n_castle(x2) & of(x2,x3) & n_sand(x3) & n_sibling(x1) & card_eq_4(x1))