People running downhill in a city.
A girl is walking by the lake.
running is contradictory to walking
exists e1 s1 x1 x2 x3.(a_topic(x1) & in(e1,x3) & n_city(x3) & a_downhill(s1) & Manner(e1,s1) & Actor(e1,x2) & v_run(e1) & (x1 = x2) & n_people(x1))
exists e1 x1 x2.(n_lake(x2) & by(e1,x2) & Actor(e1,x1) & v_walk(e1) & n_girl(x1))