One boy hoists another boy up on his back.
A boy holds another boy up on his back to play leap frog.
Just because a boy holds another boy on his back doesn't mean it is to play leap frog
exists e1 s1 x1 x2 x3.(on(e1,x3) & n_back(x3) & of(x3,x2) & n_male(x2) & a_up(s1) & Manner(e1,s1) & Theme(e1,x2) & Actor(e1,x1) & v_hoist(e1) & n_boy(x2) & -(x2 = x1) & n_boy(x1) & n_boy(x1) & card_eq_1(x1))
exists e1 p1 s1 x1 x2 x3 x4.(Topic(e1,p1) & exists e2 x5 x6.(Theme(e2,x5) & Actor(e2,x1) & v_play(e2) & n_frog(x5) & of(x5,x6) & n_leap(x6)) & on(e1,x4) & n_back(x4) & of(x4,x1) & n_male(x1) & a_up(s1) & Manner(e1,s1) & Theme(e1,x3) & Actor(e1,x2) & v_hold(e1) & n_boy(x3) & -(x3 = x1) & n_boy(x1) & n_boy(x1) & n_boy(x2))