math-nli: Output if sentence 2 Entails statement 1 or Contradicts statement 1 - 
sentence 1: Lewis had some raspberry. Ann gave him 5 more. Now Lewis has 18 raspberry. 
sentence 2:  Lewis had 9 raspberry in the beginning.
<equate> (18 - 5, 9)
Lewis had some raspberry. Ann gave him 5 more. Now Lewis has 18 raspberry. 
 Lewis had 9 raspberry in the beginning.