A barechested man surfs on a white surfboard.
A barechested man surfs a small wave.
While surfing requires waves, the waves need not be small
exists s1 s2 x1 x2 x3.(a_topic(x1) & on(x1,x3) & n_surfboard(x3) & a_white(s2) & Theme(s2,x3) & n_surf(x1) & of(x1,x2) & n_man(x2) & a_barechested(s1) & Theme(s1,x1))
exists e1 s1 s2 x1 x2.(Theme(e1,x2) & Actor(e1,x1) & v_surf(e1) & n_wave(x2) & a_small(s2) & Theme(s2,x2) & n_man(x1) & a_barechested(s1) & Theme(s1,x1))