context: There is a very good chance that Brian is a swan. There is a very good chance that Emily is a cat. It is almost certain that Mary went to the bedroom.
hypothesis: It is probably not the case that either 'Emily is a cat' or 'Brian is a swan' but not both.
valid_hypothesis: It is probably not the case that either 'Emily is a cat' or 'Brian is a swan' but not both.
invalid_hypothesis: It is certain that either 'Emily is a cat' or 'Brian is a swan' but not both.
problog: 
    and(A,B) :- A,B.
    or(A,B) :- A;B.
    nand(A,B) :- not(and(A,B)).
    nor(A,B) :- not(or(A,B)).
    xor(A,B) :- or(A,B), nand(A,B).
  
    %hop0
    0.8::factA.
    0.8::factB.
    0.95::factC.
    
  
    %hop2
    conclusion:-xor(factB,factA).
  
    query(conclusion).
    
hypothesis_assertion: Either 'Emily is a cat' or 'Brian is a swan' but not both.