Men on horses displaying their flags at a joust.
Men are riding bicycles.
horses  is not the same as bicycles
exists e1 x1 x2 x3 x4 x5.(a_topic(x1) & on(x1,x2) & at(e1,x5) & n_joust(x5) & Theme(e1,x4) & Actor(e1,x3) & v_display(e1) & n_flag(x4) & of(x4,x1) & n_thing(x1) & (x2 = x3) & n_horse(x2) & n_man(x1))
exists e1 x1 x2.(Theme(e1,x2) & Actor(e1,x1) & v_ride(e1) & n_bicycle(x2) & n_man(x1))