context: It is certain that Bill left the milk. We believe that Bernhard is a frog. It is improbable that John went to the bedroom.
hypothesis: There is a very good chance that 'John went to the bedroom and Bernhard is a frog'.
valid_hypothesis: It is improbable that 'John went to the bedroom and Bernhard is a frog'.
invalid_hypothesis: There is a very good chance that 'John went to the bedroom and Bernhard is a frog'.
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
    1.0::factA.
    0.75::factB.
    0.1::factC.
    
  
    %hop2
    conclusion:-and(factC,factB).
  
    query(conclusion).
    
hypothesis_assertion: 'John went to the bedroom and Bernhard is a frog'.