math-nli: Output if sentence 2 Entails statement 1 or Contradicts statement 1 - 
sentence 1: Thomas had some Pen. William gave him 8 more. Now Thomas has 47 Pen. 
sentence 2:  Thomas had 39 pens to begin with.
<equate> (47 - 8, 39)
Thomas had some Pen. William gave him 8 more. Now Thomas has 47 Pen. 
 Thomas had 39 pens to begin with.