context: It is highly likely that Emily is a wolf. It is highly unlikely that John picked up the milk. It is highly likely that Julius is white.
hypothesis: We doubt that 'Julius is white and Emily is a wolf'.
valid_hypothesis: There is a very good chance that 'Julius is white and Emily is a wolf'.
invalid_hypothesis: We doubt that 'Julius is white and Emily is a wolf'.
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.
    0.05::factB.
    0.9::factC.
    
  
    %hop2
    conclusion:-and(factC,factA).
  
    query(conclusion).
    
hypothesis_assertion: 'Julius is white and Emily is a wolf'.