A young girl is chasing a pigeon near a set of stairs.
A girl is chasing a puppy.
Chasing a pigeon can't be done while chasing a puppy.
exists e1 s1 x1 x2 x3 x4.(near(e1,x3) & of(x3,x4) & n_stair(x4) & n_set(x3) & Theme(e1,x2) & Actor(e1,x1) & v_chase(e1) & n_pigeon(x2) & n_girl(x1) & a_young(s1) & Theme(s1,x1))
exists e1 x1 x2.(Theme(e1,x2) & Actor(e1,x1) & v_chase(e1) & n_puppy(x2) & n_girl(x1))