One guy surfing the waves in the ocean.
Two guys watching the waves of an ocean.
One and two are different.
exists e1 x1 x2 x3 x4.(n_ocean(x4) & n_wave(x3) & a_topic(x1) & in(e1,x4) & Theme(e1,x3) & Actor(e1,x2) & v_surf(e1) & (x1 = x2) & n_guy(x1) & card_eq_1(x1))
exists e1 x1 x2 x3 x4.(n_wave(x3) & a_topic(x1) & Theme(e1,x3) & Actor(e1,x2) & v_watch(e1) & of(x3,x4) & n_ocean(x4) & (x1 = x2) & n_guy(x1) & card_eq_2(x1))