Machinists at work with heavy machinery.
Machinists are playing the piano.
Machinists at work with heavy machinery cannot be the ones playing the piano.
exists s1 x1 x2 x3.(a_topic(x1) & at(x1,x2) & with(x2,x3) & n_machinery(x3) & a_heavy(s1) & Theme(s1,x3) & n_work(x2) & n_machinist(x1))
exists e1 x1 x2.(n_piano(x2) & Theme(e1,x2) & Actor(e1,x1) & v_play(e1) & n_machinist(x1))