A trolley heading down the street
vehicle heading in town
A trolley heading down a street in town
exists e1 x1 x2 x3.(n_street(x3) & a_topic(x1) & down(e1,x3) & Actor(e1,x2) & v_head(e1) & (x1 = x2) & n_trolley(x1))
exists e1 x1 x2 x3.(a_topic(x1) & in(e1,x3) & n_town(x3) & Actor(e1,x2) & v_head(e1) & (x1 = x2) & n_vehicle(x1))