A shirtless man is doing a skateboard trick.
no humans are doing a trick.
man and no human depends the presence
exists e1 s1 x1 x2 x3.(Theme(e1,x2) & Actor(e1,x1) & v_do(e1) & n_trick(x2) & of(x2,x3) & n_skateboard(x3) & n_man(x1) & a_shirtless(s1) & Theme(s1,x1))
-exists e1 x1 x2.(Theme(e1,x2) & Actor(e1,x1) & v_do(e1) & n_trick(x2) & n_human(x1))