context: We doubt that Mary went to the bedroom. It is highly likely that Bernhard is yellow. There is a better than even chance that Brian is yellow.
hypothesis: Chances are about even that 'Brian is yellow and Bernhard is yellow'.
valid_hypothesis: Chances are about even that 'Brian is yellow and Bernhard is yellow'.
invalid_hypothesis: There is almost no chance that 'Brian is yellow and Bernhard is yellow'.
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.
    0.9::factB.
    0.6::factC.
    
  
    %hop2
    conclusion:-and(factC,factB).
  
    query(conclusion).
    
hypothesis_assertion: 'Brian is yellow and Bernhard is yellow'.