Two men wave from atop a piece of heavy machinery.
The men wave from atop the machinery.
Heavy machinery is a type of machinery.
exists s1 x1 x2 x3 x4 x5.(a_topic(x1) & atop(x3,x4) & of(x4,x5) & n_machinery(x5) & a_heavy(s1) & Theme(s1,x5) & n_piece(x4) & from(x1,x3) & n_thing(x3) & n_wave(x1) & of(x1,x2) & n_man(x2) & card_eq_2(x1))
exists x1 x2 x3 x4.(n_machinery(x4) & n_wave(x1) & of(x1,x2) & n_man(x2) & a_topic(x1) & atop(x3,x4) & from(x1,x3) & n_thing(x3))