context: It is almost certain that John moved to the office. We doubt that Greg is green. It is probable that Lily is a rhino.
hypothesis: Chances are slight that 'Greg is green and Lily is a rhino'.
valid_hypothesis: Chances are slight that 'Greg is green and Lily is a rhino'.
invalid_hypothesis: It is certain that 'Greg is green and Lily is a rhino'.
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
    0.95::factA.
    0.2::factB.
    0.7::factC.
    
  
    %hop2
    conclusion:-and(factB,factC).
  
    query(conclusion).
    
hypothesis_assertion: 'Greg is green and Lily is a rhino'.