A man painting as another man watches by the river.
An artist is painting a river.
not all men who paint are artist
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_paint(e1) & n_river(x2) & n_artist(x1))