A woman is standing in front of a wall with a bunch of graffiti.
A lady is standing in front of a wall.
The woman standing in front of a wall, is referred to as a "lady" in the second sentence; this is the same person.
exists e1 x1 x2 x3 x4 x5.(with(e1,x4) & of(x4,x5) & n_graffitus(x5) & n_bunch(x4) & in(e1,x2) & of(x2,x3) & n_wall(x3) & n_front(x2) & Actor(e1,x1) & v_stand(e1) & n_woman(x1))
exists e1 x1 x2 x3.(in(e1,x2) & of(x2,x3) & n_wall(x3) & n_front(x2) & Actor(e1,x1) & v_stand(e1) & n_lady(x1))