math-nli: Output if sentence 2 Entails statement 1 or Contradicts statement 1 - 
sentence 1: Fred has 709 green balloons, he gave Sandy 221 of the balloons. 
sentence 2:  Fred now has 488 green balloons.
<equate> (709-221, 488)
Fred has 709 green balloons, he gave Sandy 221 of the balloons. 
 Fred now has 488 green balloons.