The man is holding a SLOW sign.
The man is holding a traffic sign.
Both sentences include a man holding a sign.
exists e1 x1 x2 x3.(n_man(x1) & Theme(e1,x2) & Actor(e1,x1) & v_hold(e1) & n_sign(x2) & (x2 = x3) & ne_org_slow(x3))
exists e1 x1 x2 x3.(n_man(x1) & Theme(e1,x2) & Actor(e1,x1) & v_hold(e1) & n_sign(x2) & of(x2,x3) & n_traffic(x3))