premise: A zebra is nibbling on some grass.
hypothesis: A zebra is not nibbling on grass.
explanation_1: Nibbling and not nibbling are different.
premise_logic: exists e1 x1 x2.(on(e1,x2) & n_grass(x2) & Actor(e1,x1) & v_nibble(e1) & n_zebra(x1))
hypothesis_logic: exists x1.(-exists e1 x2.(on(e1,x2) & n_grass(x2) & Actor(e1,x1) & v_nibble(e1)) & n_zebra(x1))
premise_sim: exists e1 x1 x2.(v_nibble(e1) & on(e1,x2) & n_zebra(x1) & n_grass(x2) & Actor(e1,x1))
hypothesis_sim: exists x1.(n_zebra(x1) & all e1 x2.(-v_nibble(e1) | -on(e1,x2) | -n_grass(x2) | -Actor(e1,x1)))