premise: A small boy is riding a water slide
hypothesis: The boy is on a waterslide with his brother.
explanation_1: A boy does not have to be small.  Just because a boy is riding a water slide it does not mean he is with his brother.
premise_logic: exists e1 s1 x1 x2 x3.(Theme(e1,x2) & Actor(e1,x1) & v_ride(e1) & n_slide(x2) & of(x2,x3) & n_water(x3) & n_boy(x1) & a_small(s1) & Theme(s1,x1))
hypothesis_logic: exists p1 x1 x3.(n_brother(x3) & of(x3,x1) & n_male(x1) & n_boy(x1) & exists x2.(on(x1,x2) & with(x2,x3) & n_waterslide(x2)))
premise_sim: exists e1 s1 x1 x2 x3.(v_ride(e1) & of(x2,x3) & n_water(x3) & n_slide(x2) & n_boy(x1) & a_small(s1) & Theme(s1,x1) & Theme(e1,x2) & Actor(e1,x1))
hypothesis_sim: exists x1 x3.(of(x3,x1) & n_male(x1) & n_brother(x3) & n_boy(x1) & exists x2.(with(x2,x3) & on(x1,x2) & n_waterslide(x2)))