A man in a blue wetsuit rides a wave on a white surfboard.
A woman is surfing.
There can be either a man or a woman.
exists e1 s1 s2 x1 x2 x3 x4.(Theme(e1,x3) & Actor(e1,x1) & v_ride(e1) & on(x3,x4) & n_surfboard(x4) & a_white(s2) & Theme(s2,x4) & n_wave(x3) & in(x1,x2) & n_wetsuit(x2) & a_blue(s1) & Theme(s1,x2) & n_man(x1))
exists e1 x1.(Actor(e1,x1) & v_surf(e1) & n_woman(x1))