context: There is a very good chance that Winona is a sheep. It is almost certain that Julius is white. It is unlikely that Sandra got the milk.
hypothesis: It is certain that 'Sandra got the milk and Julius is white'.
valid_hypothesis: It is unlikely that 'Sandra got the milk and Julius is white'.
invalid_hypothesis: It is certain that 'Sandra got the milk and Julius is white'.
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.
    0.95::factB.
    0.2::factC.
    
  
    %hop2
    conclusion:-and(factC,factB).
  
    query(conclusion).
    
hypothesis_assertion: 'Sandra got the milk and Julius is white'.