A mint green trolley passes though a city.
A bus passed through a city.
There can be either a mint green trolley or a bus.
exists e1 s1 s2 x1 x2 x3.(a_though(s2) & Manner(e1,s2) & Theme(e1,x3) & Actor(e1,x1) & v_pass(e1) & n_city(x3) & n_trolley(x1) & a_green(s1) & Theme(s1,x1) & of(x1,x2) & n_mint(x2))
exists e1 x1 x2 x3.(a_topic(x1) & through(e1,x3) & n_city(x3) & Theme(e1,x2) & v_pass(e1) & (x1 = x2) & n_bus(x1))