math-nli: Output if sentence 2 Entails statement 1 or Contradicts statement 1 - 
sentence 1: Thomas had 251 blackberry. Darlene clutched some blackberry. Now Thomas has 77  blackberry. 
sentence 2:  Darlene clutched 173 blackberries.
<equate> (251 - 77, 173)
Thomas had 251 blackberry. Darlene clutched some blackberry. Now Thomas has 77  blackberry. 
 Darlene clutched 173 blackberries.