math-nli: Output if sentence 2 Entails statement 1 or Contradicts statement 1 - 
sentence 1: Harvey had some Flower. Ellis gave him 4 more. Now Harvey has 15 Flower. 
sentence 2:  Harvey had 9 flowers initially.
<equate> (15 - 4, 9)
Harvey had some Flower. Ellis gave him 4 more. Now Harvey has 15 Flower. 
 Harvey had 9 flowers initially.