A elderly man wearing a blue sweater is surrounded by pigeons on the street.
A man is outside by birds.
If a man is on the street surrounded by pigeons, then it follows that he is outside by birds; pigeons are a type of bird.
exists e2 e1 s1 s2 x1 x2 x3 x4 x5.(n_street(x5) & Actor(e2,x4) & on(x4,x5) & n_pigeon(x4) & Theme(e2,x1) & v_surround(e2) & Theme(e1,x3) & Actor(e1,x2) & v_wear(e1) & n_sweater(x3) & a_blue(s2) & Theme(s2,x3) & (x1 = x2) & n_man(x1) & a_elderly(s1) & Theme(s1,x1))
exists s1 x1 x2.(by(s1,x2) & n_bird(x2) & Theme(s1,x1) & a_outside(s1) & n_man(x1))