context: It is almost certain that Brian is a rhino. We doubt that Gertrude is a mouse. We believe that Julius is a swan.
hypothesis: It is unlikely that 'Gertrude is a mouse and Brian is a rhino'.
valid_hypothesis: It is unlikely that 'Gertrude is a mouse and Brian is a rhino'.
invalid_hypothesis: It is highly likely that 'Gertrude is a mouse and Brian is a rhino'.
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
    0.95::factA.
    0.2::factB.
    0.75::factC.
    
  
    %hop2
    conclusion:-and(factB,factA).
  
    query(conclusion).
    
hypothesis_assertion: 'Gertrude is a mouse and Brian is a rhino'.