context: It is unlikely that Bernhard is green. It is probable that Julius is a lion. It is unlikely that John dropped the apple.
hypothesis: Chances are slight that 'Julius is a lion and Bernhard is green'.
valid_hypothesis: Chances are slight that 'Julius is a lion and Bernhard is green'.
invalid_hypothesis: It is certain that 'Julius is a lion 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.
    0.7::factB.
    0.2::factC.
    
  
    %hop2
    conclusion:-and(factB,factA).
  
    query(conclusion).
    
hypothesis_assertion: 'Julius is a lion and Bernhard is green'.