math-nli: Output if sentence 2 Entails statement 1 or Contradicts statement 1 - 
sentence 1: Tom has 9 yellow balloons. Sara has 8 yellow balloons. 
sentence 2:  Tom and Sara have 17 yellow balloons in total.
<equate> (9+8, 17)
Tom has 9 yellow balloons. Sara has 8 yellow balloons. 
 Tom and Sara have 17 yellow balloons in total.