math-nli: Output if sentence 2 Entails statement 1 or Contradicts statement 1 - 
sentence 1: Michelle had some Book. Chris gave him 6 more. Now Michelle has 25 Book. 
sentence 2:  Michelle had 19 books in the beginning.
<equate> (25 - 6, 19)
Michelle had some Book. Chris gave him 6 more. Now Michelle has 25 Book. 
 Michelle had 19 books in the beginning.