math-nli: Output if sentence 2 Entails statement 1 or Contradicts statement 1 - 
sentence 1: Fred has 40 baseball cards . Keith bought 22 of Fred 's baseball cards . 
sentence 2:  Fred has 18 baseball cards.
<equate> (40 - 22, 18)
Fred has 40 baseball cards . Keith bought 22 of Fred 's baseball cards . 
 Fred has 18 baseball cards.