math-nli: Output if sentence 2 Entails statement 1 or Contradicts statement 1 - 
sentence 1: Shawn had some Pen. Cheryl gave him 9 more. Now Shawn has 38 Pen. 
sentence 2:  Shawn had 29 pens initially.
<equate> (38 - 9, 29)
Shawn had some Pen. Cheryl gave him 9 more. Now Shawn has 38 Pen. 
 Shawn had 29 pens initially.