The man is standing next to a fire hydrant and playing a saxophone.
A man is playing an instrument by a fire hydrant
next to and by are prepositions with the same meaning.
exists e1 e2 x1 x2 x3 x4.(n_man(x1) & Theme(e2,x4) & Actor(e2,x1) & v_play(e2) & n_saxophone(x4) & to(e1,x2) & n_hydrant(x2) & of(x2,x3) & n_fire(x3) & r_next(e1) & Actor(e1,x1) & v_stand(e1))
exists e1 x1 x2 x3 x4.(Theme(e1,x2) & Actor(e1,x1) & v_play(e1) & by(x2,x3) & n_hydrant(x3) & of(x3,x4) & n_fire(x4) & n_instrument(x2) & n_man(x1))