Two people stand near a blue wall with graffiti with the city skyline behind.
The couple are both tourists.
People standing near graffitied walls are not all tourists.
exists e1 s1 s2 x1 x2 x3 x4 x5.(n_skyline(x4) & of(x4,x5) & n_city(x5) & a_behind(s2) & Manner(e1,s2) & with(e1,x3) & with(x3,x4) & n_graffitus(x3) & near(e1,x2) & n_wall(x2) & a_blue(s1) & Theme(s1,x2) & Actor(e1,x1) & v_stand(e1) & n_people(x1) & card_eq_2(x1))
exists p1 x1 x2.(n_tourist(x2) & n_couple(x1) & (x1 = x2))