math-nli: Output if sentence 2 Entails statement 1 or Contradicts statement 1 - 
sentence 1: Catherine had some Watch. Margaret gave him 2 more. Now Catherine has 37 Watch. 
sentence 2:  Catherine had 31 Watch in the beginning.
<equate> (37 - 2, 31)
Catherine had some Watch. Margaret gave him 2 more. Now Catherine has 37 Watch. 
 Catherine had 31 Watch in the beginning.