A man working with machinery with other men.
A man is tinkering on machinery.
If he is tinkering on machinery, then he is working with machinery.
exists e1 x1 x2 x3 x4.(a_topic(x1) & with(e1,x4) & -(x4 = x1) & n_man(x1) & n_man(x1) & n_man(x4) & with(e1,x3) & n_machinery(x3) & Actor(e1,x2) & v_work(e1) & (x1 = x2))
exists e1 x1 x2.(on(e1,x2) & n_machinery(x2) & Actor(e1,x1) & v_tinker(e1) & n_man(x1))