math-nli: Output if sentence 2 Entails statement 1 or Contradicts statement 1 - 
sentence 1: Steven had 193 fig. William clutched some fig. Now Steven has 21  fig. 
sentence 2:  William clutched 173 figs.
<equate> (193 - 21, 173)
Steven had 193 fig. William clutched some fig. Now Steven has 21  fig. 
 William clutched 173 figs.