Four people dressed in identical blue clothes are cleaning the grass.
Four co-workers are working on a lawn.
Just because the four people are cleaning the grass, does not imply that they are working on a lawn.
exists e1 e2 s1 s2 x1 x2 x3 x4.(n_grass(x4) & Theme(e2,x4) & Actor(e2,x1) & v_clean(e2) & in(e1,x3) & n_clothes(x3) & a_blue(s2) & Theme(s2,x3) & a_identical(s1) & Theme(s1,x3) & Theme(e1,x2) & v_dress(e1) & (x1 = x2) & n_people(x1) & card_eq_4(x1))
exists e1 x1 x2.(on(e1,x2) & n_lawn(x2) & Actor(e1,x1) & v_work(e1) & n_co-worker(x1) & card_eq_4(x1))