context: Chances are about even that Lily is a rhino. It is certain that John went to the hallway. It is unlikely that Daniel grabbed the milk.
hypothesis: It is unlikely that 'Daniel grabbed the milk and John went to the hallway'.
valid_hypothesis: It is unlikely that 'Daniel grabbed the milk and John went to the hallway'.
invalid_hypothesis: We believe that 'Daniel grabbed the milk and John went to the hallway'.
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.
    1.0::factB.
    0.2::factC.
    
  
    %hop2
    conclusion:-and(factC,factB).
  
    query(conclusion).
    
hypothesis_assertion: 'Daniel grabbed the milk and John went to the hallway'.