math-nli: Output if sentence 2 Entails statement 1 or Contradicts statement 1 - 
sentence 1: Carrie had some kiwi(fruit). Thomas gave him 8 more. Now Carrie has 21 kiwi(fruit). 
sentence 2:  Carrie had 13 kiwi(fruit) initially.
<equate> (21 - 8, 13)
Carrie had some kiwi(fruit). Thomas gave him 8 more. Now Carrie has 21 kiwi(fruit). 
 Carrie had 13 kiwi(fruit) initially.