A man is working on the railroad.
The person is a male.
man is male.
exists e1 x1 x2.(n_railroad(x2) & on(e1,x2) & Actor(e1,x1) & v_work(e1) & n_man(x1))
exists p1 x1.(n_person(x1) & exists x2.((x1 = x2) & n_male(x2)))