Four people in hats stand to watch an event, two of them with cameras.
Two assistants help their two photographer friends at an event.
Not all people are friends or assistants.
exists e1 p1 x1 x2.(Topic(e1,p1) & Actor(e1,x1) & v_stand(e1) & exists e2 x3 x4 x5.(Theme(e2,x3) & Actor(e2,x1) & v_watch(e2) & rel(x3,x4) & with(x4,x5) & n_camera(x5) & of(x4,x1) & n_thing(x4) & card_eq_2(x4) & n_event(x3)) & n_thing(x1) & in(x1,x2) & n_hat(x2) & n_people(x1) & card_eq_4(x1))
exists e1 x1 x2 x3 x4.(at(e1,x4) & n_event(x4) & Theme(e1,x2) & Actor(e1,x1) & v_help(e1) & n_friend(x2) & of(x2,x3) & n_photographer(x3) & card_eq_2(x2) & of(x2,x1) & n_thing(x1) & n_assistant(x1) & card_eq_2(x1))