math-nli: Output if sentence 2 Entails statement 1 or Contradicts statement 1 - 
sentence 1: Erica had 179 toy. David took 79 from him. Now 
sentence 2:  Erica has 79 toys.
<equate> (179 - 79, 79)
Erica had 179 toy. David took 79 from him. Now 
 Erica has 79 toys.