context: It is almost certain that Bernhard is gray. There is little chance that John put down the apple. It is certain that Jason is tired.
hypothesis: Chances are slight that 'Bernhard is gray and John put down the apple'.
valid_hypothesis: Chances are slight that 'Bernhard is gray and John put down the apple'.
invalid_hypothesis: It is highly likely that 'Bernhard is gray and John put down the apple'.
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.
    0.1::factB.
    1.0::factC.
    
  
    %hop2
    conclusion:-and(factA,factB).
  
    query(conclusion).
    
hypothesis_assertion: 'Bernhard is gray and John put down the apple'.