A man in an orange vest is working on a train.
A man searching for lost food near a train.
Working on a train does not imply searching for lost food.
exists e1 x1 x2 x3 x4.(on(e1,x4) & n_train(x4) & Actor(e1,x1) & v_work(e1) & in(x1,x2) & n_vest(x2) & of(x2,x3) & n_orange(x3) & n_man(x1))
exists e1 e2 x1 x2 x3 x4.(a_topic(x1) & for(e1,x3) & near(x3,x4) & n_train(x4) & n_food(x3) & Theme(e2,x3) & v_lose(e2) & Actor(e1,x2) & v_search(e1) & (x1 = x2) & n_man(x1))