Protesters joining on a city street.
Protestors join inside a capital building.
One can not be on a street and inside a building simultaneously.
exists e1 x1 x2 x3 x4.(a_topic(x1) & on(e1,x3) & n_street(x3) & of(x3,x4) & n_city(x4) & Actor(e1,x2) & v_join(e1) & (x1 = x2) & n_protester(x1))
exists e1 x1 x2 x3 x4.(inside(e1,x3) & n_building(x3) & of(x3,x4) & n_capital(x4) & Theme(e1,x2) & Actor(e1,x1) & v_join(e1) & n_thing(x2) & n_protestor(x1))