One person is playing a harp and another is on a horn at a festival.
People are playing french horns.
You can not infer they are playing french horns.
exists e1 p1 x1 x2 x3 x4.(at(p1,x4) & n_festival(x4) & exists x5.(on(x3,x5) & n_horn(x5)) & n_thing(x3) & Theme(e1,x2) & Actor(e1,x1) & v_play(e1) & n_harp(x2) & n_person(x1) & card_eq_1(x1))
exists e1 s1 x1 x2.(Theme(e1,x2) & Actor(e1,x1) & v_play(e1) & n_horn(x2) & a_french(s1) & Theme(s1,x2) & n_people(x1))