math-nli: Output if sentence 2 Entails statement 1 or Contradicts statement 1 - 
sentence 1: William had some plum. Blanche gave him 5 more. Now William has 23 plum. 
sentence 2:  William had 18 plums in the first place.
<equate> (23 - 5, 18)
William had some plum. Blanche gave him 5 more. Now William has 23 plum. 
 William had 18 plums in the first place.