City workers are working on the subway.
people outside
City workers provides specificity that people does not, therefore, the sentences are contradictory.
exists e1 x1 x2 x3.(n_subway(x3) & on(e1,x3) & Actor(e1,x1) & v_work(e1) & n_worker(x1) & (x1 = x2) & ne_geo_city(x2))
exists s1 x1 x2.(a_topic(x1) & Theme(s1,x2) & a_outside(s1) & (x1 = x2) & n_people(x1))