A boy hanging upside down on a ladder next to another boy climbing a knotted rope.
A boys hangs from a ladder.
A boy is is upside down on a ladder, which is one way to hang on a ladder.  Sentence 2 is implied by sentence 1.
exists e1 p1 x1 x2.(a_topic(x1) & exists e2 e3 s1 x3 x4 x5 x6 x7.(r_upside(s1) & on(s1,x3) & to(x4,x5) & Theme(e3,x7) & Actor(e3,x6) & v_climb(e3) & n_rope(x7) & Theme(e2,x7) & v_knot(e2) & (x5 = x6) & n_boy(x5) & -(x5 = x1) & next(x3,x4) & n_thing(x4) & n_ladder(x3) & Theme(s1,x2) & a_down(s1)) & n_boy(x1) & n_boy(x1) & Topic(e1,p1) & Actor(e1,x2) & v_hang(e1) & (x1 = x2))
exists e1 x1 x2.(from(e1,x2) & n_ladder(x2) & Actor(e1,x1) & v_hang(e1) & n_boy(x1))