A man in a blue outfit works on a train.
a repairman is in the rail yard.
Not all men that work on a train is a repairman.
exists e1 s1 x1 x2 x3.(on(e1,x3) & n_train(x3) & Actor(e1,x1) & v_work(e1) & in(x1,x2) & n_outfit(x2) & a_blue(s1) & Theme(s1,x2) & n_man(x1))
exists p1 x1 x2 x3.(n_yard(x2) & of(x2,x3) & n_rail(x3) & in(x1,x2) & n_repairman(x1))