math-nli: Output if sentence 2 Entails statement 1 or Contradicts statement 1 - 
sentence 1: Patricia had some toy. Charles gave him 5 more. Now Patricia has 15 toy. 
sentence 2:  Patricia had 10 toy to begin with.
<equate> (15 - 5, 10)
Patricia had some toy. Charles gave him 5 more. Now Patricia has 15 toy. 
 Patricia had 10 toy to begin with.