context: Chances are about even that John moved to the garden. It is highly unlikely that Julius is green. It is highly unlikely that Winona is a mouse.
hypothesis: It is impossible that 'Julius is green and Winona is a mouse'.
valid_hypothesis: It is impossible that 'Julius is green and Winona is a mouse'.
invalid_hypothesis: It is certain that 'Julius is green and Winona is a mouse'.
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
    0.5::factA.
    0.05::factB.
    0.05::factC.
    
  
    %hop2
    conclusion:-and(factB,factC).
  
    query(conclusion).
    
hypothesis_assertion: 'Julius is green and Winona is a mouse'.