People stroll down a sidewalk of a city street.
A group of people are sitting on a bench waiting for the bus.
The people cannot be sitting and strolling at the same time.
exists e1 s1 x1 x2 x3 x4.(a_down(s1) & Manner(e1,s1) & Theme(e1,x2) & Actor(e1,x1) & v_stroll(e1) & of(x2,x3) & n_street(x3) & of(x3,x4) & n_city(x4) & n_sidewalk(x2) & n_people(x1))
exists e2 e1 x1 x2 x3 x4.(n_bus(x4) & for(e1,e2) & for(e2,x4) & Actor(e2,x1) & v_wait(e2) & on(e1,x3) & n_bench(x3) & Actor(e1,x1) & v_sit(e1) & of(x1,x2) & n_people(x2) & n_group(x1))