premise: A person sweeping stairs in a park.
hypothesis: A dog singing karaoke.
explanation_1: First, we have a person sweeping stairs and then we have a dog that is singing karaoke with no definite location.  Further, dogs do not sing.
explanation_2: Sentence two can not be about a dog if sentence one is about a person
explanation_3: a person is not a dog, and while the dog is singing the person is sweeping.
premise_logic: exists x1 x2 x3.(a_topic(x1) & in(x1,x3) & n_park(x3) & n_sweeping(x1) & Time(x1,x2) & n_stair(x2) & n_person(x1))
hypothesis_logic: exists e1 x1 x2 x3.(a_topic(x1) & Theme(e1,x3) & Actor(e1,x2) & v_sing(e1) & n_karaoke(x3) & (x1 = x2) & n_dog(x1))
premise_sim: exists x1 x2 x3.(n_sweeping(x1) & n_stair(x2) & n_person(x1) & n_park(x3) & in(x1,x3) & a_topic(x1) & Time(x1,x2))
hypothesis_sim: exists e1 x1 x2 x3.(v_sing(e1) & n_karaoke(x3) & n_dog(x1) & a_topic(x1) & Theme(e1,x3) & Actor(e1,x2) & (x1 = x2))