math-nli: Output if sentence 2 Entails statement 1 or Contradicts statement 1 - 
sentence 1: William had 186 blackcurrant. Sarah took 173 from him. Now 
sentence 2:  William has 13 blackcurrants.
<equate> (186 - 173, 13)
William had 186 blackcurrant. Sarah took 173 from him. Now 
 William has 13 blackcurrants.