math-nli: Output if sentence 2 Entails statement 1 or Contradicts statement 1 - 
sentence 1: William had 171 blackcurrant. Kathy gripped some blackcurrant. Now William has 19  blackcurrant. 
sentence 2:  Kathy gripped 152 blackcurrants.
<equate> (171 - 19, 152)
William had 171 blackcurrant. Kathy gripped some blackcurrant. Now William has 19  blackcurrant. 
 Kathy gripped 152 blackcurrants.