context: There is a better than even chance that Mary dropped the milk. It is improbable that Brian is a swan. It is certain that Julius is a lion.
hypothesis: It is likely that 'Julius is a lion and Brian is a swan'.
valid_hypothesis: It is improbable that 'Julius is a lion and Brian is a swan'.
invalid_hypothesis: It is likely that 'Julius is a lion and Brian is a swan'.
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
    0.6::factA.
    0.1::factB.
    1.0::factC.
    
  
    %hop2
    conclusion:-and(factC,factB).
  
    query(conclusion).
    
hypothesis_assertion: 'Julius is a lion and Brian is a swan'.