A father in black shorts and his son are walking down the beach.
Two men are surfing.
The two men could either be walking down the beach, or surfing. They cannot do both simultaneously.
exists e1 s1 x1 x2 x3 x4 x5.(n_beach(x5) & down(e1,x5) & Actor(e1,x1) & v_walk(e1) & in(x1,x2) & subset_of(x4,x2) & n_son(x4) & of(x4,x1) & n_male(x1) & subset_of(x3,x2) & n_shorts(x3) & a_black(s1) & Theme(s1,x3) & n_father(x1))
exists e1 x1.(Actor(e1,x1) & v_surf(e1) & n_man(x1) & card_eq_2(x1))