A bunch of people at a train station.
A group of people are swimming in the lake.
They are either at a train station or in the lake.
exists x1 x2 x3 x4.(a_topic(x1) & at(x1,x3) & n_station(x3) & of(x3,x4) & n_train(x4) & of(x1,x2) & n_people(x2) & n_bunch(x1))
exists e1 x1 x2 x3.(n_lake(x3) & in(e1,x3) & Actor(e1,x1) & v_swim(e1) & of(x1,x2) & n_people(x2) & n_group(x1))