A bare chested man riding a surfboard on a wave in an ocean.
A man is preparing dinner on a surfboard.
The man can only be riding the surfboard or preparing dinner on it, not both.
exists e1 s1 s2 x1 x2 x3 x4 x5.(a_topic(x1) & in(e1,x5) & n_ocean(x5) & on(e1,x4) & n_wave(x4) & Theme(e1,x3) & Actor(e1,x2) & v_ride(e1) & n_surfboard(x3) & (x1 = x2) & n_man(x1) & a_chested(s2) & Theme(s2,x1) & a_bare(s1) & Theme(s1,x1))
exists e1 x1 x2 x3.(Theme(e1,x2) & Actor(e1,x1) & v_prepare(e1) & on(x2,x3) & n_surfboard(x3) & n_dinner(x2) & n_man(x1))