context: There is a very good chance that Bernhard is white. It is unlikely that Fred went to the garden. It is impossible that Daniel grabbed the apple.
hypothesis: We believe that 'Daniel grabbed the apple' or 'Fred went to the garden' or both.
valid_hypothesis: We doubt that 'Daniel grabbed the apple' or 'Fred went to the garden' or both.
invalid_hypothesis: We believe that 'Daniel grabbed the apple' or 'Fred went to the garden' 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
    0.8::factA.
    0.2::factB.
    0.0::factC.
    
  
    %hop2
    conclusion:-or(factC,factB).
  
    query(conclusion).
    
hypothesis_assertion: 'Daniel grabbed the apple' or 'Fred went to the garden' or both.