A man painting as another man watches by the river.
A person is making art.
Painting is a form of art so if a man is painting then a person is making art.
exists x1 x2 x3 x4 x5 x6.(n_river(x6) & a_topic(x1) & by(x1,x6) & as(x1,x4) & n_watch(x4) & of(x4,x5) & n_man(x5) & -(x4 = x3) & n_watch(x3) & of(x3,x2) & n_man(x2) & n_man(x2) & n_painting(x1) & of(x1,x2))
exists e1 x1 x2.(Theme(e1,x2) & Actor(e1,x1) & v_make(e1) & n_art(x2) & n_person(x1))