math-nli: Output if sentence 2 Entails statement 1 or Contradicts statement 1 - 
sentence 1: Joan went to 4 football games this year. She went to 9 football games last year. 
sentence 2:  Joan went to 13 football games in all.
<equate> (4+9, 13)
Joan went to 4 football games this year. She went to 9 football games last year. 
 Joan went to 13 football games in all.