context: It is highly likely that Julius is a lion. It is impossible that Lily is a rhino. Chances are slight that Sandra grabbed the milk.
hypothesis: We believe that 'Julius is a lion and Sandra grabbed the milk'.
valid_hypothesis: There is little chance that 'Julius is a lion and Sandra grabbed the milk'.
invalid_hypothesis: We believe that 'Julius is a lion and Sandra grabbed the milk'.
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.
    0.0::factB.
    0.1::factC.
    
  
    %hop2
    conclusion:-and(factA,factC).
  
    query(conclusion).
    
hypothesis_assertion: 'Julius is a lion and Sandra grabbed the milk'.