A man in a black cowboy hat loads something onto a horse.
A man is milking a cow.
If a man is loading something onto a horse, then he cannot be milking a cow.
exists s1 x1 x2 x3 x4 x5 x6.(a_topic(x1) & in(x1,x2) & onto(x2,x6) & n_horse(x6) & Time(x2,x5) & n_something(x5) & n_load(x2) & of(x2,x4) & n_hat(x4) & of(x2,x3) & n_cowboy(x3) & a_black(s1) & Theme(s1,x2) & n_man(x1))
exists e1 x1 x2.(Theme(e1,x2) & Actor(e1,x1) & v_milk(e1) & n_cow(x2) & n_man(x1))