Two girls sit at a table with a green marker standing on its end.
Two girls find a seat near a green marker.
Both sentences tell us that there are two girls. If we know that the girls sit at a table with a green marker on it then we already know that the girls have found a seat near the green marker.
exists e1 s1 x1 x2 x3 x4 x5.(at(e1,x2) & with(x2,x3) & on(x3,x5) & n_end(x5) & of(x5,x1) & n_thing(x1) & n_standing(x3) & of(x3,x4) & n_marker(x4) & a_green(s1) & Theme(s1,x3) & n_table(x2) & Actor(e1,x1) & v_sit(e1) & n_girl(x1) & card_eq_2(x1))
exists e1 s1 x1 x2 x3.(near(e1,x3) & n_marker(x3) & a_green(s1) & Theme(s1,x3) & Theme(e1,x2) & Actor(e1,x1) & v_find(e1) & n_seat(x2) & n_girl(x1) & card_eq_2(x1))