Spectators are seated behind a blue wall.
People are seated behind a red wall.
Red and blue are not the same color.
exists e1 s1 x1 x2.(behind(e1,x2) & n_wall(x2) & a_blue(s1) & Theme(s1,x2) & Theme(e1,x1) & v_seat(e1) & n_spectator(x1))
exists e1 s1 x1 x2.(behind(e1,x2) & n_wall(x2) & a_red(s1) & Theme(s1,x2) & Theme(e1,x1) & v_seat(e1) & n_people(x1))