premise: A boy stands in the middle of a crowd of teenagers.
hypothesis: A girl stands in the middle of a crowd of teenagers.
explanation_1: It is a girl, not a boy.
explanation_2: One can i either be a boy or a girl not both.
explanation_3: Either a boy or a girl stands.
premise_logic: exists e1 x1 x2 x3 x4.(n_middle(x2) & in(e1,x2) & of(x2,x3) & of(x3,x4) & n_teenager(x4) & n_crowd(x3) & Actor(e1,x1) & v_stand(e1) & n_boy(x1))
hypothesis_logic: exists e1 x1 x2 x3 x4.(n_middle(x2) & in(e1,x2) & of(x2,x3) & of(x3,x4) & n_teenager(x4) & n_crowd(x3) & Actor(e1,x1) & v_stand(e1) & n_girl(x1))