premise: The blond boy is riding roller-coaster with his mouth wide open.
hypothesis: a little boy is riding a roller-coaster
explanation_1: The boy riding the roller coaster is not necessarily little. Teenagers and young adults also enjoy amusement park rides.
explanation_2: It doesn't say that he is a little boy
explanation_3: A blond boy doesn't have to be little.
premise_logic: exists e1 s1 s2 x1 x2 x3 x4.(n_open(x3) & a_wide(s2) & Theme(s2,x3) & of(x3,x4) & n_mouth(x4) & of(x3,x1) & n_male(x1) & n_boy(x1) & a_blond(s1) & Theme(s1,x1) & with(e1,x3) & Theme(e1,x2) & Actor(e1,x1) & v_ride(e1) & n_roller-coaster(x2))
hypothesis_logic: exists e1 s1 x1 x2.(Theme(e1,x2) & Actor(e1,x1) & v_ride(e1) & n_roller-coaster(x2) & n_boy(x1) & a_little(s1) & Theme(s1,x1))