A man in a wetsuit is surfing on a white surfboard.
A man is surfing in the desert.
A man could not be surfing in the desert
exists e1 s1 x1 x2 x3.(on(e1,x3) & n_surfboard(x3) & a_white(s1) & Theme(s1,x3) & Actor(e1,x1) & v_surf(e1) & in(x1,x2) & n_wetsuit(x2) & n_man(x1))
exists e1 x1 x2.(n_desert(x2) & in(e1,x2) & Actor(e1,x1) & v_surf(e1) & n_man(x1))