context: It is certain that Daniel got the milk. It is unlikely that Julius is a swan. There is almost no chance that Mary moved to the garden.
hypothesis: It is certain that 'Julius is a swan' or 'Daniel got the milk' or both.
valid_hypothesis: It is certain that 'Julius is a swan' or 'Daniel got the milk' or both.
invalid_hypothesis: It is probably not the case that 'Julius is a swan' or 'Daniel got the milk' or both.
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
    1.0::factA.
    0.2::factB.
    0.02::factC.
    
  
    %hop2
    conclusion:-or(factB,factA).
  
    query(conclusion).
    
hypothesis_assertion: 'Julius is a swan' or 'Daniel got the milk' or both.