premise: The sky is blue
hypothesis: The sky is gray.
explanation_1: the sky cannot be both blue and gray.
premise_logic: exists s1 x1.(n_sky(x1) & Theme(s1,x1) & a_blue(s1))
hypothesis_logic: exists s1 x1.(n_sky(x1) & Theme(s1,x1) & a_gray(s1))
premise_sim: exists s1 x1.(n_sky(x1) & a_blue(s1) & Theme(s1,x1))
hypothesis_sim: exists s1 x1.(n_sky(x1) & a_gray(s1) & Theme(s1,x1))