A shirtless man is riding a motorcycle.
A man is riding a Harley Davidson.
Not all motorcycles are Harley Davidson
exists e1 s1 x1 x2.(Theme(e1,x2) & Actor(e1,x1) & v_ride(e1) & n_motorcycle(x2) & n_man(x1) & a_shirtless(s1) & Theme(s1,x1))
exists e1 x1 x2 x3.(Theme(e1,x2) & Actor(e1,x1) & v_ride(e1) & ne_org_davidson(x2) & (x2 = x3) & ne_org_harley(x3) & n_man(x1))