premise: A medium sized brown dog jumping
hypothesis: A small dog crouches under a porch.
explanation_1: Dogs are usually classified as either small or medium, but not both.
explanation_2: Medium and small are different sizes.
explanation_3: dog can't be crouches under porch if he is jumping
premise_logic: exists e1 s1 s2 s3 x1 x2.(a_topic(x1) & Actor(e1,x2) & v_jump(e1) & (x1 = x2) & n_dog(x1) & a_brown(s3) & Theme(s3,x1) & a_sized(s2) & Theme(s2,x1) & a_medium(s1) & Theme(s1,x1))
hypothesis_logic: exists s1 x1 x2 x3.(a_topic(x1) & under(x1,x3) & n_porch(x3) & n_crouch(x1) & of(x1,x2) & n_dog(x2) & a_small(s1) & Theme(s1,x1))