context: It is highly likely that John left the football. There is a better than even chance that Julius is yellow. There is almost no chance that Winona is a sheep.
hypothesis: There is a better than even chance that either 'Julius is yellow' or 'Winona is a sheep' but not both.
valid_hypothesis: There is a better than even chance that either 'Julius is yellow' or 'Winona is a sheep' but not both.
invalid_hypothesis: It is highly unlikely that either 'Julius is yellow' or 'Winona is a sheep' 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
    0.9::factA.
    0.6::factB.
    0.02::factC.
    
  
    %hop2
    conclusion:-xor(factB,factC).
  
    query(conclusion).
    
hypothesis_assertion: Either 'Julius is yellow' or 'Winona is a sheep' but not both.