Four black children sit in the sand with various empty food containers.
Four black kids play in the sand.
Kids is another way to refer to children and you can use empty food containers to play in the sand and build sandcastles.
exists e1 s1 s2 s3 x1 x2 x3 x4.(n_sand(x2) & with(e1,x3) & n_container(x3) & of(x3,x4) & n_food(x4) & a_empty(s3) & Theme(s3,x3) & a_various(s2) & Theme(s2,x3) & in(e1,x2) & Actor(e1,x1) & v_sit(e1) & n_child(x1) & a_black(s1) & Theme(s1,x1) & card_eq_4(x1))
exists e1 s1 x1 x2.(n_sand(x2) & in(e1,x2) & Actor(e1,x1) & v_play(e1) & n_kid(x1) & a_black(s1) & Theme(s1,x1) & card_eq_4(x1))