People walking in parking lot and sitting at tables.
People talking to sitting people in the open.
Many people sit. It cannot be assumed that the people sitting in the open are sitting at tables.
exists e1 e2 x1 x2 x3 x4 x5.(at(e2,x5) & n_table(x5) & Actor(e2,x4) & v_sit(e2) & n_people(x4) & in(e1,x2) & n_lot(x2) & of(x2,x3) & n_parking(x3) & Actor(e1,x1) & v_walk(e1) & n_people(x1))
exists e1 e2 x1 x2 x3 x4.(n_open(x4) & a_topic(x1) & to(e1,x3) & in(x3,x4) & n_people(x3) & Actor(e2,x3) & v_sit(e2) & Actor(e1,x2) & v_talk(e1) & (x1 = x2) & n_people(x1))