Three of four safety workers are gathered around a big yellow machine.
People are standing by a yellow machine.
Standing by rephrases gathered around.
exists e1 s1 s2 x1 x2 x3 x4.(around(e1,x4) & n_machine(x4) & a_yellow(s2) & Theme(s2,x4) & a_big(s1) & Theme(s1,x4) & Theme(e1,x1) & v_gather(e1) & of(x1,x2) & n_worker(x2) & of(x2,x3) & n_safety(x3) & card_eq_4(x2) & n_thing(x1) & card_eq_3(x1))
exists e1 s1 x1 x2.(by(e1,x2) & n_machine(x2) & a_yellow(s1) & Theme(s1,x2) & Actor(e1,x1) & v_stand(e1) & n_people(x1))