Tourists are walking the streets and looking at the shops' goods.
The tourists are having a city-trip.
Not all trips are a city-trip.
exists e2 e1 x1 x2 x3 x4 x5.(n_goods(x5) & of(x5,x4) & n_shop(x4) & n_street(x2) & at(e2,x5) & Actor(e2,x3) & v_look(e2) & n_tourist(x3) & Theme(e1,x2) & Actor(e1,x1) & v_walk(e1) & n_tourist(x1))
exists e1 x1 x2.(n_tourist(x1) & Theme(e1,x2) & Actor(e1,x1) & v_have(e1) & n_city-trip(x2))