premise: A boy riding on a carnival ride turns around for a photograph.
hypothesis: Nobody is riding
explanation_1: there can either be a boy riding or nobody is riding
explanation_2: Answer: Either a boy is riding or no one is riding .
explanation_3: A boy riding means that it is not true that nobody is riding.
premise_logic: exists e1 s1 s2 x1 x2 x3 x4.(a_around(s2) & Manner(e1,s2) & for(e1,x4) & n_photograph(x4) & Actor(e1,x1) & v_turn(e1) & on(x1,x3) & n_ride(x3) & a_carnival(s1) & Theme(s1,x3) & n_riding(x1) & of(x1,x2) & n_boy(x2))
hypothesis_logic: -exists e1 x1.(Actor(e1,x1) & v_ride(e1) & n_person(x1))