premise: A man is holding a book standing in front of a chalkboard.
hypothesis: A man is holding a book about fossils, standing in front of a chalkboard.
explanation_1: You can not infer the book is about fossils.
explanation_2: The book may be of anything not particularly of fossils.
explanation_3: Just because a man is holding a book standing in front of a chalkboard does not mean the book is about fossils.
premise_logic: exists e1 x1 x2 x3 x4 x5.(in(e1,x4) & of(x4,x5) & n_chalkboard(x5) & n_front(x4) & Theme(e1,x2) & Actor(e1,x1) & v_hold(e1) & n_standing(x2) & of(x2,x3) & n_book(x3) & n_man(x1))
hypothesis_logic: exists e2 e1 x1 x2 x3 x4 x5.(for(e1,e2) & in(e2,x4) & of(x4,x5) & n_chalkboard(x5) & n_front(x4) & Actor(e2,x1) & v_stand(e2) & Theme(e1,x2) & Actor(e1,x1) & v_hold(e1) & about(x2,x3) & n_fossil(x3) & n_book(x2) & n_man(x1))