A large white pipe is being lowered on a trailer, as two workers stand by.
There are no workers present.
Either no workers are present or two workers are standing by.
exists e1 p1 s1 s2 s3 x1 x2.(a_by(s3) & Manner(e1,s3) & exists e2 x3.(Actor(e2,x3) & v_stand(e2) & n_worker(x3) & card_eq_2(x3)) & as(e1,p1) & on(e1,x2) & n_trailer(x2) & Theme(e1,x1) & v_lower(e1) & n_pipe(x1) & a_white(s2) & Theme(s2,x1) & a_large(s1) & Theme(s1,x1))
exists p1 x1.-exists s1 x2 x3.((x1 = x2) & Theme(s1,x3) & a_present(s1) & (x2 = x3) & n_worker(x2))