Four children are playing on a hill of sand.
Four kids are outside.
Children are kids. Playing on a hill of sand is playing outside.
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 s1 x1.(Theme(s1,x1) & a_outside(s1) & n_kid(x1) & card_eq_4(x1))