People with strollers walking on a bridge.
There are parents with strollers walking on a bridge.
Not all people with strollers are parents.
exists e1 x1 x2 x3 x4.(a_topic(x1) & with(x1,x2) & on(e1,x4) & n_bridge(x4) & Actor(e1,x3) & v_walk(e1) & (x2 = x3) & n_stroller(x2) & n_people(x1))
exists e1 p1 x1 x2 x3.(on(e1,x3) & n_bridge(x3) & Actor(e1,x2) & v_walk(e1) & with(p1,x2) & n_stroller(x2) & exists x4.((x1 = x4) & n_parent(x4)))