context: It is highly unlikely that Mary went to the bedroom. It is certain that Winona is a wolf. We believe that John moved to the office.
hypothesis: It is probably not the case that either 'Winona is a wolf' or 'John moved to the office' but not both.
valid_hypothesis: It is probably not the case that either 'Winona is a wolf' or 'John moved to the office' but not both.
invalid_hypothesis: It is probable that either 'Winona is a wolf' or 'John moved to the office' 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
    0.05::factA.
    1.0::factB.
    0.75::factC.
    
  
    %hop2
    conclusion:-xor(factB,factC).
  
    query(conclusion).
    
hypothesis_assertion: Either 'Winona is a wolf' or 'John moved to the office' but not both.