Tourists observe a geographic landmark through viewfinders.
Two travelers are looking at the sites.
Just because tourists observe a geographic landmark through viewfinders does not mean there are two travelers.
exists e1 s1 x1 x2 x3.(through(e1,x3) & n_viewfinder(x3) & Theme(e1,x2) & Actor(e1,x1) & v_observe(e1) & n_landmark(x2) & a_geographic(s1) & Theme(s1,x2) & n_tourist(x1))
exists e1 x1 x2.(n_site(x2) & at(e1,x2) & Actor(e1,x1) & v_look(e1) & n_traveler(x1) & card_eq_2(x1))