context: We doubt that Julius is a rhino. It is almost certain that Daniel got the milk. It is likely that Bernhard is green.
hypothesis: There is little chance that 'Julius is a rhino and Bernhard is green'.
valid_hypothesis: There is little chance that 'Julius is a rhino and Bernhard is green'.
invalid_hypothesis: It is likely that 'Julius is a rhino and Bernhard is green'.
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
    0.2::factA.
    0.95::factB.
    0.7::factC.
    
  
    %hop2
    conclusion:-and(factA,factC).
  
    query(conclusion).
    
hypothesis_assertion: 'Julius is a rhino and Bernhard is green'.