Cranes work on the frame of a building under construction.
A dog is playing catch.
Cranes and dog are different.
exists x1 x2 x3 x4 x5.(n_frame(x3) & a_topic(x1) & on(x1,x3) & of(x3,x4) & under(x4,x5) & n_construction(x5) & n_building(x4) & n_work(x1) & (x1 = x2) & ne_nam_cranes(x2))
exists e1 x1 x2.(Theme(e1,x2) & Actor(e1,x1) & v_play(e1) & n_catch(x2) & n_dog(x1))