math-nli: Output if sentence 2 Entails statement 1 or Contradicts statement 1 - 
sentence 1: Dena had 84 Biscuit. Brad took 81 from him. Now 
sentence 2:  Dena has 4 biscuits.
<equate> (84 - 81, 4)
Dena had 84 Biscuit. Brad took 81 from him. Now 
 Dena has 4 biscuits.