premise: A lab dog is standing on a fallen tree trunk with a guy in the background.
hypothesis: the animal is sitting under tree
explanation_1: A dog cannot be standing on a fallen tree trunk and sitting under a tree simultaneously.  One cannot sit under a fallen tree.
explanation_2: An animal is not necessarily a lab dog. If the dog is standing, then it is not sitting. If the dog is on a fallen tree, then it is not under the tree.
explanation_3: A dog cannot be standing on a fallen tree trunk and also sitting at the same time. Also, the tree must either be fallen or standing.
premise_logic: exists e1 s1 x1 x2 x3 x4 x5 x6.(n_background(x6) & with(e1,x5) & in(x5,x6) & n_guy(x5) & on(e1,x3) & n_trunk(x3) & of(x3,x4) & n_tree(x4) & a_fallen(s1) & Theme(s1,x3) & Actor(e1,x1) & v_stand(e1) & n_dog(x1) & of(x1,x2) & n_lab(x2))
hypothesis_logic: exists e1 x1 x2.(n_animal(x1) & under(e1,x2) & n_tree(x2) & Actor(e1,x1) & v_sit(e1))
premise_sim: exists e1 s1 x1 x2 x3 x4 x5 x6.(with(e1,x5) & v_stand(e1) & on(e1,x3) & of(x3,x4) & of(x1,x2) & n_trunk(x3) & n_tree(x4) & n_lab(x2) & n_guy(x5) & n_dog(x1) & n_background(x6) & in(x5,x6) & a_fallen(s1) & Theme(s1,x3) & Actor(e1,x1))
hypothesis_sim: exists e1 x1 x2.(v_sit(e1) & under(e1,x2) & n_tree(x2) & n_animal(x1) & Actor(e1,x1))